A user asked the Google Webmaster team, "How many changes did Google make to their primary search algorithm in 2009". Matt Cutts' most recent video post answered this question and confirmed what many have speculated about Google algorithm updates for some time now.

Matt stated that Google "makes a change to their core search algorithm at least once a day." He further mentions that in 2009 Google "updated the search algorithm 350 to 400 times.

The video can be seen in its entirety at Google Webmaster Help YouTube channel.

Matt Cutts is the head of Google’s Webspam team.