Google Sidewiki was a browser sidebar tool that allowed users to contribute information to any web page. Launched September 23, 2009; shut down September 2, 2011 — it lived 1 year. One of 26 Google products killed in 2011. Google Sidewiki was a web annotation service from Google, launched in September 2009 and discontinued in December 2011. Sidewiki was accessible through a browser extension that allowed anyone logged into a Google Account to make and view comments about a given website in a sidebar. Despite the name, Sidewiki was not a collaborative wiki, though the comments were editable by the author. Wiki link Data: Killed by Google (killedbygoogle.com, MIT).