Well, you can't say there isn't a need for it. After scam after scam, Twitter is introducing a service to foil the phishers.
"By routing all links submitted to Twitter through this new service, we can detect, intercept, and prevent the spread of bad links across all of Twitter" says the company on its blog.
"Even if a bad link is already sent out in an email notification and somebody clicks on it, we'll be able keep that user safe."
The company is starting with direct messages - and email notifications about direct messages - since this is where most attacks occur, it says. The implication is that it plans to introduce the service to public tweets.
Users shouldn't see much of an effect, apart from some links in direct messages and email notifications about them being shortened to twt.tl.