The Wizards of Buzz - WSJ.com

http://online.wsj.com/public/article/SB117106531769704150-zpK10wf4CJOB4IKoJS5anu...

Social bookmarking sites, where Web surfers share their favorite links, are giving a few heavy users power to shape the online viewing habits of thousands. These hidden influencers have an outsize effect on ads, trends and the sites that get plucked from obscurity. Plus, a podcast on the phenomenon.

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