Twitter can be viewed at as a “marketing tool, feedreader, tracking device, communication tool & news breaker” all rolled into one. Or, Twitter can be seen as a collective life stream of a community of which you are a member.
Twitter is hard to describe specifically because it is a social utility
with more possible uses than a Swiss Army knife. Here are 101 examples
of how Twitter members regularly use the service. Note that the content
below has been taken directly from Twitter users’ posts, with all
grammar, syntax and spelling left fully intact.