In the next few months Twitter, a service I've been using for the last nine years, is expected to announce a huge change to the service. This is in line with it becoming much more of a news site instead of a social network.
This article argues that the proposed change won't be as crude as simply allowing users to go from 140 characters to 10,000 characters overnight. Right now, Twitter acts as a kind of dashboard for information that exists elsewhere on the web. In a situation that's almost the inverse to Facebook, users link to blog posts, YouTube videos, etc. that aren't hosted on the site itself.
The new version of Twitter is likely to be much more of a 'walled garden' where users will be kept to be monetised for the benefit of shareholders to the service. If there was a realistic option other than Twitter at this point, I would have already jumped ship.