Twitter's immediacy affects not just original short messages, but also their life span, according to new research from social-analytics firm Sysomos.
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.
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.
According to the Nielsen Company, Twitter has taken the lead as a distribution hub for information about the disaster.
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.