Member communities, such as social networks and blogs, have increased in popularity within the last year, according to Global Faces and Networked Places, a report published in March by the Nielsen Company. The report found that 45 billion minutes were spent on member communities in 2008.
Twitter breeds quitters? According to a Nielsen survey, 60 percent of tweeters quit within the first month.
In case of emergency, you can hear it through the grapevine. Microsoft is beta-testing Vine, which is similiar to Twitter. Users can receive real-time emergency updates from media outlets nationwide.