'COX: So what is micro-blogging? And why are more people starting to do it?

BENNETT: Well, it's a form of blogging that allows people to send brief text updates or short messages to other subscribers of that same service. Now, the most popular micro-blogging site is Twitter, and researchers at the Pew Internet in American Life Project recently conducted a survey about Twitter, and they found, rather unsurprisingly, that American Twitter users are young, active in social media and highly mobile, they write.

And most are between the ages of 18 and 34, and the cool thing is that Twitter's actually advancing the cause of citizen journalism. Earlier in the year, Twitter users, for instance, they sent updates and photos of the U.S. Airways flight landing in the Hudson River well before those same photos and information ended up on mainstream news outlets.

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