Del Harvey who leads Twitter’s Trust and Safety team blogged yesterday that the social networking/micro-blogging service has begun filtering all links in Twitter Direct Messages to stop phishing:
“Since these attacks occur primarily on Direct Messages and email notifications about Direct Messages, this is where we have focused our initial efforts. For the most part, you will not notice this feature because it works behind the scenes but you may notice links shortened to twt.tl in Direct Messages and email notifications.”
Twitter blog piece Here.