When microblogging and social networking site Twitter debuted three years ago, plenty of people wrote it off as yet another pointless addition in the overcrowded networking world. Little by little, users proved the site's worth to nonbelievers. Considering the site only allows people to post, or Tweet, messages of 140 characters or less, you can't blame early skeptics.
Last year, student James Karl Buck was traveling in Egypt and wound up in jail. He Tweeted "arrested" to notify his friends of what was going open and ultimately get out of jail. During the 2008 presidential election, candidates reached out to voters using the service. When a plane crashed into the Hudson River in January, a Twitter user posted the first photograph from the scene.