Twitter is a social networking site that allows users to post short text-based messages called tweets. Tweets can be shared publicly or with a select group of followers. While it provides journalists a quick way to report brief news and follow other reporters, tweets are limited to 140 characters and credibility can be questioned with false information. However, Twitter's growth rate has been rapid and it is becoming a faster source for news, with some predicting it will play a larger targeted and niche role in the future of journalism.