Lijit Microblogging Overview Social Bookmarking 
Techipedia: Tamar Weinberg
JANUARY 26, 2010
But with all other social networks, there are rules of engagement that are determined by the community. Brief Overview of StumbleUpon Since everyone is mostly raving about Twitter and Facebook as of late, I’m going to briefly define StumbleUpon and explain how it works.
Techipedia: Tamar Weinberg
JANUARY 5, 2009
Social Media Sites: General The Big Boys of Social Bookmarking: The Top 20 Sites (10e20): Chris Winfield ranks the top 20 social bookmarking sites by their Alexa rankings and gives a short description of what each does — in case you haven’t ventured beyond Digg. Maybe next year, folks! Even in 2008.
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