2006 API Blogosphere Social Networking 
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. What are the most popular sites in these age groups?
Buzz Marketing for Technology
JUNE 27, 2008
At the time of writing this introduction (August 2006), no particular product or service exists that can definitively be categorised as a PLE, although some prototypical work is in progress. This article has been compiled after tracking recent conversations in the blogosphere and following social bookmarks. EduTools, 2006).
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