Reported from late March 2008. Dewey caused a large, unexplained ranking reshuffle; Matt Cutts asked for feedback, and some believed Google was boosting its own properties such as Google Books.
Reported mid-June 2007 and named after departing Googler Vanessa Fox. Buffy moved some single-word rankings, but Matt Cutts said it was not really an update, just small changes.
Launched 16 May 2007. Universal Search blended news, images, video, maps and books into Google's web results, ending the ten-blue-links page and opening new routes to visibility.
Reported in late 2006. Many pages slipped into Google's supplemental index, which Google tied to low PageRank; the label was dropped in July 2007 and the separate index phased out.
Rolled out in three stages in October and November 2005. Jagger devalued reciprocal link swaps, link farms and paid links and hit hidden text and cloaking, an early forerunner of Penguin.
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