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Facebook has begun the rollout of a new feature, Facebook Questions, which will allow users to get answers to their queries from the entire Facebook community.Similar in concept to Yahoo! Answers, Quora and Mahalo, Facebook Questions gives users the opportunity to ask questions just by clicking the “Ask Question” button on the homepage. Questions is also available on friends’ profiles just as you would post on someone’s wall.

Twitter is a form of "mircroblogging" similar to status updates in Facebook except you do not need to be invited or approved as a friend (although you do have the power to change that).  You are limited to 140 characters. 

But peer into Sean Nash’s Marine Biology class at Benton High School, and you see students using Facebook-like applications, Twitter and cell phones in their studies. His class embraces the technology rather than avoids it.