CAN-SPAM Digg PageRank Wikipedia 
Webbiquity
FEBRUARY 14, 2010
According to Wikipedia (among the worst nofollow offenders ), “The nofollow HTML attribute was originally designed to stop comment spam on blogs. An alarming number of once-respectable social bookmarking sites—Digg, delicious, Mister Wong, Reddit, Mixx, Bibsonomy, Jumptags, Faves, Yahoo! I’m not alone on this.
WebMarketCentral
OCTOBER 15, 2009
According to Wikipedia (among the worst nofollow offenders ), "The nofollow HTML attribute was originally designed to stop comment spam on blogs. An alarming number of once-respectable social bookmarking sites—Digg, delicious, Mister Wong, Reddit, Mixx, Bibsonomy, Jumptags, Faves, Yahoo! I'm not alone on this.
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