Création des Logiciels de gestion d'Entreprise, Création et référencement des sites web, Réseaux et Maintenance, Conception
Seo Master present to you: 
By Justin Uberti, Chromium team
Cross-posted with the Chromium Blog
By Justin Uberti, Chromium teamCross-posted with the Chromium Blog
Cube Slam is a Chrome Experiment built with WebRTC, an open web technology that lets you communicate in real-time in the browser (and in this case, play an old-school arcade game with your friends) without downloading and installing any plug-ins. In this post, we wanted to explain a bit about how Cube Slam works.
Cube Slam uses getUserMedia to access your webcam and microphone (with your permission, of course), RTCPeerConnection to stream your video to a friend, and RTCDataChannel to transfer the bits that keep the gameplay in sync. If you and your friend are behind firewalls, RTCPeerConnection uses a TURN relay server (hosted on Google Compute Engine) to make the connection. When there are no firewalls in the way, however, the entire game happens directly peer-to-peer, reducing latency for players and server costs for developers.
Cube Slam is the first large-scale application to use RTCDataChannel, which provides an API similar to WebSocket, but sends the data over the RTCPeerConnection peer-to-peer link. RTCDataChannel sends data securely, and supports an "unreliable" mode for cases where you want high performance but don't care about every single packet making it across the network. In cases like games where low delay often matters more than perfect delivery, this ensures that a single stray packet doesn't slow down the whole app.
RTCDataChannel only supports unreliable mode in desktop Chrome today. We're working on implementing the latest WebRTC spec, where we'll use the standard SCTP protocol to support reliable mode. WebRTC will also be available on Chrome for Android later this year, and you can try it now by flipping “Enable WebRTC Android” in chrome://flags. Several browsers are currently working on implementing WebRTC, and we’re looking forward to the day when you can have a Cube Slam face-off against your friends on any browser and any device.
To learn more about the tech in Cube Slam, you can check out our technology page and source code. Disable the shields! Destroy the screen! Have fun!
Justin Uberti is one of the co-creators of the WebRTC initiative, and leads the WebRTC engineering team at Google. Previously, Justin helped create Google+ Hangouts.
Posted by Ashleigh Rentz, Editor Emerita
2013, By: Seo Mastersalam every one, this is a topic from google web master centrale blog: Webmaster Level: All
We certainly hope you never have to use our new Help for hacked sites informational series. It's a dozen articles and over an hour of videos dedicated to helping webmasters in the unfortunate event that their site is compromised.
Overview: How and why sites are hacked
If you have further interest in why cybercriminals hack sites for spammy purposes, see Tiffany Oberoi’s explanation in Step 5: Assess the damage (hacked with spam).
Tiffany Oberoi, a Webspam engineer, shares more information about sites hacked with spam
And if you’re curious about malware, Lucas Ballard from our Safe Browsing team, explains more about the topic in Step 5: Assess the damage (hacked with malware).
Lucas Ballard, a Safe Browsing engineer, and I pretend to have a totally natural conversation about malware
While we attempt to outline the necessary steps in recovery, each task remains fairly difficult for site owners unless they have advanced knowledge of system administrator commands and experience with source code. For helping fellow webmasters through the difficult recovery time, we'd like to thank the steady members in Webmaster Forum. Specifically, in the subforum Malware and hacked sites, we'd be remiss not to mention the amazing contributions of Redleg and Denis Sinegubko.
How to avoid ever needing Help for hacked sites
Just as you focus on making a site that's good for users and search-engine friendly, keeping your site secure -- for you and your visitors -- is also paramount. When site owners fail to keep their site secure, hackers may exploit the vulnerability. If a hacker exploits a vulnerability, then you might need Help for hacked sites. So, to potentially avoid this scenario:
this is a topic published in 2013... to get contents for your blog or your forum, just contact me at: devnasser@gmail.com
We certainly hope you never have to use our new Help for hacked sites informational series. It's a dozen articles and over an hour of videos dedicated to helping webmasters in the unfortunate event that their site is compromised.
Overview: How and why sites are hacked
If you have further interest in why cybercriminals hack sites for spammy purposes, see Tiffany Oberoi’s explanation in Step 5: Assess the damage (hacked with spam).
Tiffany Oberoi, a Webspam engineer, shares more information about sites hacked with spam
And if you’re curious about malware, Lucas Ballard from our Safe Browsing team, explains more about the topic in Step 5: Assess the damage (hacked with malware).
Lucas Ballard, a Safe Browsing engineer, and I pretend to have a totally natural conversation about malware
While we attempt to outline the necessary steps in recovery, each task remains fairly difficult for site owners unless they have advanced knowledge of system administrator commands and experience with source code. For helping fellow webmasters through the difficult recovery time, we'd like to thank the steady members in Webmaster Forum. Specifically, in the subforum Malware and hacked sites, we'd be remiss not to mention the amazing contributions of Redleg and Denis Sinegubko.
How to avoid ever needing Help for hacked sites
Just as you focus on making a site that's good for users and search-engine friendly, keeping your site secure -- for you and your visitors -- is also paramount. When site owners fail to keep their site secure, hackers may exploit the vulnerability. If a hacker exploits a vulnerability, then you might need Help for hacked sites. So, to potentially avoid this scenario:
- Be vigilant about keeping software updated
- Understand the security practices of all applications, plugins, third-party software, etc., before you install them on your server. A security vulnerability in one software application can affect the safety of your entire site
- Remove unnecessary or unused software
- Enforce creation of strong passwords
- Keep all devices used to log in to your servers secure (updated operating system and browser)
- Make regular, automated backups of your site
this is a topic published in 2013... to get contents for your blog or your forum, just contact me at: devnasser@gmail.com
salam every one, this is a topic from google web master centrale blog: Webmaster Level: Intermediate
Did you know that a majority of users surveyed feel that having information in their own language was more important than a low price? Living in a non-English-speaking country, I've seen friends and family members explicitly look for and use local and localized websites—properly localized sites definitely have an advantage with users. Google works hard to show users the best possible search results. Many times those are going to be pages that are localized, for the user's location and/or in the user's language.
If you're planning to take the time to create and maintain a localized version of your website, making it easy to recognize and find is a logical part of that process. In this blog post series, we'll take a look at what is involved with multi-regional and multi-lingual websites from a search engine point of view. A multi-regional website is one that explicitly targets users in various regions (generally different countries); we call it multilingual when it is available in multiple languages, and sometimes, the website targets both multiple regions and is in multiple languages. Let's start with some general preparations and then look at websites that target multiple regions.
All websites start with domain names; when it comes to domain names, Google differentiates between two types of domain names:
Note that we do not use locational meta tags (like "geo.position" or "distribution") or HTML attributes for geotargeting. While these may be useful in other regards, we've found that they are generally not reliable enough to use for geotargeting.
As you can see, geotargeting is not an exact science (even sites using country-code top level domain names can be global in nature), so it's important that you plan for the users from the "wrong" location. One way to do this could be to show links on all pages for users to select their region and language of choice. We'll look at some other possible solutions further on in this blog post series.
Do you already have a website that targets multiple regions or do you have questions about the process of planning one? Come to the Help Forum and join the discussion. In following posts, we'll take a look at multi-lingual websites and then look at some special situations that can arise with global websites. Bis bald!
this is a topic published in 2013... to get contents for your blog or your forum, just contact me at: devnasser@gmail.com
Did you know that a majority of users surveyed feel that having information in their own language was more important than a low price? Living in a non-English-speaking country, I've seen friends and family members explicitly look for and use local and localized websites—properly localized sites definitely have an advantage with users. Google works hard to show users the best possible search results. Many times those are going to be pages that are localized, for the user's location and/or in the user's language.
If you're planning to take the time to create and maintain a localized version of your website, making it easy to recognize and find is a logical part of that process. In this blog post series, we'll take a look at what is involved with multi-regional and multi-lingual websites from a search engine point of view. A multi-regional website is one that explicitly targets users in various regions (generally different countries); we call it multilingual when it is available in multiple languages, and sometimes, the website targets both multiple regions and is in multiple languages. Let's start with some general preparations and then look at websites that target multiple regions.
Preparing for global websites
Expanding a website to cover multiple regions and/or languages can be challenging. By creating multiple versions of your website, any issues with the base version will be multiplied; make sure that you have everything working properly before you start. Given that this generally means you'll suddenly be working with a multiplied number of URLs, don't forget that you'll need appropriate infrastructure to support the website.Planning multi-regional websites
When planning sites for multiple regions (usually countries), don't forget to research legal or administrative requirements that might come into play first. These requirements may determine how you proceed, for instance whether or not you would be eligible to use a country-specific domain name.All websites start with domain names; when it comes to domain names, Google differentiates between two types of domain names:
- ccTLDs (country-code top level domain names): These are tied to a specific country (for example .de for Germany, .cn for China). Users and search engines use this as a strong sign that your website is explicitly for a certain country.
- gTLDs (generic top level domain names): These are not tied to a specific country. Examples of gTLds are .com, .net, .org, .museum. Google sees regional top level domain names such as .eu and .asia as gTLDs, since they cannot be tied to a specific country. We also treat some vanity ccTLDs (such as .tv, .me, etc.) as gTLDs as we've found that users and webmasters frequently see these as being more generic than country-targeted (we don't have a complete list of such vanity ccTLDs that we treat as gTLDs as it may change over time). You can set geotargeting for websites with gTLDs using the Webmaster Tools Geographic Target setting.
Geotargeting factors
Google generally uses the following elements to determine the geotargeting of a website (or a part of a website):- Use of a ccTLD is generally a strong signal for users since it explicitly specifies a single country in an unmistakable way.
or
Webmaster Tools' manual geotargeting for gTLDs (this can be on a domain, subdomain or subdirectory level); more information on this can be found in our blog post and in the Help Center. With region tags from geotargeting being shown in search results, this method is also very clear to users. Please keep in mind that it generally does not make sense to set a geographic target if the same pages on your site target more than a single country (say, all German-speaking countries) — just write in that language and do not use the geotargeting setting (more on writing in other languages will follow soon!). - Server location (through the IP address of the server) is frequently near your users. However, some websites use distributed content delivery networks (CDNs) or are hosted in a country with better webserver infrastructure, so we try not to rely on the server location alone.
- Other signals can give us hints. This could be from local addresses & phone numbers on the pages, use of local language and currency, links from other local sites, and/or the use of Google's Local Business Center (where available).
Note that we do not use locational meta tags (like "geo.position" or "distribution") or HTML attributes for geotargeting. While these may be useful in other regards, we've found that they are generally not reliable enough to use for geotargeting.
URL structures
The first three elements used for geotargeting are strongly tied to the server and to the URLs used. It's difficult to determine geotargeting on a page by page basis, so it makes sense to consider using a URL structure that makes it easy to segment parts of the website for geotargeting. Here are some of the possible URL structures with pros and cons with regards to geotargeting:| ccTLDs eg: example.de, example.fr | Subdomains with gTLDs eg: de.site.com, fr.site.com, etc. | Subdirectories with gTLDs eg: site.com/de/, site.com/fr/, etc. | URL parameters eg: site.com?loc=de, ?country=france, etc. |
| pros (+) - clear geotargeting - server location is irrelevant - easy separation of sites - legal requirements (sometimes) | pros (+) - easy to set up - can use Webmaster Tools geotargeting - allows different server locations - easy separation of sites | pros (+) - easy to set up - can use Webmaster Tools geotargeting - low maintenance (same host) | pros (+) (not recommended) |
| cons (-) - expensive (+ availability) - more infrastructure - ccTLD requirements (sometimes) | cons (-) - users might not recognize geotargeting from the URL alone (is "de" the language or country?) | cons (-) - users might not recognize geotargeting from the URL alone - single server location - separation of sites harder | cons (-) - segmentation based on the URL is difficult - users might not recognize geotargeting from the URL alone - geotargeting in Webmaster Tools is not possible |
As you can see, geotargeting is not an exact science (even sites using country-code top level domain names can be global in nature), so it's important that you plan for the users from the "wrong" location. One way to do this could be to show links on all pages for users to select their region and language of choice. We'll look at some other possible solutions further on in this blog post series.
Dealing with duplicate content on global websites
Websites that provide content for different regions and in different languages sometimes create content that is the same or similar but available on different URLs. This is generally not a problem as long as the content is for different users in different countries. While we strongly recommend that you provide unique content for each different group of users, we understand that this may not always be possible for all pages and variations from the start. There is generally no need to "hide" the duplicates by disallowing crawling in a robots.txt file or by using a "noindex" robots meta tag. However, if you're providing the same content to the same users on different URLs (for instance, if both "example.de/" and "example.com/de/" show German language content for users in Germany), it would make sense to choose a preferred version and to redirect (or use the "rel=canonical" link element) appropriately.Do you already have a website that targets multiple regions or do you have questions about the process of planning one? Come to the Help Forum and join the discussion. In following posts, we'll take a look at multi-lingual websites and then look at some special situations that can arise with global websites. Bis bald!
this is a topic published in 2013... to get contents for your blog or your forum, just contact me at: devnasser@gmail.com