Twitter's immediacy affects not just original short messages, but also their life span, according to new research from social-analytics firm Sysomos.
Google Docs is available to anyone without a Google account, Facebook launches an official privacy page, and Sysomos breaks down the demographics of the blogosphere.
Twitter gave its official blessing to nine new companies. Shoutlet, Adobe Social, Percolate, and others can keep selling their Twitter services without fear of being shut down.
According to the Nielsen Company, Twitter has taken the lead as a distribution hub for information about the disaster.
Since the tweet "Text HAITI to 90999 to donate $10 to @RedCross relief" went viral, more than $8 million in donations surpasses mobile giving throughout all of 2009.
The competition will be particularly fierce at the annual digital-culture bash between Foursquare and Gowalla, rival social-media services that want to own the location-based networking market.