Penguin – April 24, 2012:
speculation about an “Over-optimization penalty”, Google finally rolled out the “Webspam Update”. The main purpose of the Penguin update is to put a deep freeze on web spam in Google’s search results. By extension, a big piece of that web spam appears to be links from low-quality networks.
Google penguin update and recovery tips
Another step to reward high-quality sites
Panda 3.5 – April 19, 2012:
Google quietly rolled out a Panda data update.
Pagination Elements – September 15, 2011:
To help fix crawl and duplication problems created by pagination, Google introduced the rel=”next” and rel=”prev” link attributes
Google:Pagination with rel=“next” and rel=“prev”
12-pack Sitelinks – August 16, 2011:
Google was expanded sitelinks, displaying up to 12 at a time for top-ranking sites and including secondary snippets in SERPs.
The evolution of sitelinks: expanded and improved
Panda Goes Global – August 12, 2011:
Panda updates occurred separately from the main index and not in real-time, reminiscent of early Google Dance updates.
Google+ – June 28, 2011:
Google launched the +1 button. Clicking [+1] allowed users to influence search results within their social circle, across both organic and paid results.
Introducing the Google+ project: Real-life sharing, rethought for the web
Google Instant – September 2010:
A magnifying appeared on Google search results, allowing search visitors to quickly view a preview of landing pages directly from SERPs.
Caffeine update – June 2010:
Google introduces new search index-Caffeine aimed to give fresher results.
Our new search index: Caffeine
Real-time Search – December 2009:
Google goes real-time. Facebook, Twitter, MySpace, Buzz, etc. to influence Google rankings
June 2009:
Google spiders can index Flash application, and also images /texts used by these applications.
April 2009:
Google becomes more relevant searches