Twitter is a microblogging website that allows users to post short "tweets" of up to 140 characters. It has a simple, user-friendly interface and is one of the most popular social networking sites. Users can post tweets through the website, mobile apps, or third-party apps. While males currently make up over 60% of users, those aged 35-49 represent the largest demographic on Twitter. The number of Twitter users grew from 475,000 in 2008 to over 7 million in 2009, a 1382% increase.