Google launched Knol in 2007 to help improve web content by enabling experts to collaborate on in-depth articles. Knol will work as usual till April 30, 2012, and users can download their knols to a file and/or migrate them to WordPress.com. From May 1 through October 1, 2012, knols will no longer be viewable, but can be downloaded and exported. After that time, Knol content will no longer be accessible.
Google Search Timeline
Google Search Timeline can display a historical graph of results for a search query. The company is removing this graph of historical results for a query. Users will be able to restrict any search to particular time periods using the refinement tools on the left-hand side of the search page.
Additionally, users who wish to see graphs with historical trends for a Web search can use google.com/trends or google.com/insights/search/ for data since 2004. For more historical data, the “ngram viewer” in Google Books offers similar
In March Google said goodbye to the Gears browser extension for creating offline web applications and stopped supporting new browsers. On December 1, 2011, Gears-based Gmail and Calendar offline will stop working across all browsers, and later in December Gears will no longer be available for download.
The company said that this is part of its effort to help incorporate offline capabilities into HTML5. For example, users can access Gmail, Calendar and Docs offline in Chrome.
Google Friend Connect
Google Friend Connect, which allows website publishers to add social features to their sites, will be retired in March for all non-Blogger websites, Google said. It suggested that websites use its Google+ social network instead.
Friend Connect lets websites include social features on their sites so that visitors can do things like add comments, sign in, view other users and vote in polls. Shortly after the company launched Friend Connect in 2008, Facebook blocked it from accessing Facebook member data.
Google earlier announced that it would stopped development on Google Wave. But as of January 31, 2012, Wave will become read-only and users won’t be able to create new ones. On April 30 Google plans to turn it off completely.
However, users can export individual waves using the existing PDF export feature till the Google Wave service is turned off.