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A new approach could help marketers target users with the most influence.
A San Francisco-based startup called 12seconds is a video version of Twitter, but how useful will it be?
Plagued by service outages, the microblogging site rebuilds its infrastructure.
The business of social networking, cloud computing, and a flaw in the fabric of the Internet top the most notable stories of 2008.
Twitter and its competitors have spawned an entire ecosystem.
A newly launched company called Identi.ca is taking advantage of an open-source platform to challenge Twitter.
New services link up conversations and messages from across the Web.