As more and more people use Twitter, so the number of spam/porn messages has increased – partly due to users succumbing to the numbers game and blindly following and re-tweeting anything they see.
So it’s a good move for Twitter to start blocking malware, as spotted by the F-Secure blog earlier today – making the service a little safer for the less-savvy.
It seems that the filtering itself comes via Bit.ly, checking against spam filters SURBL and Google Safe Browsing, and then adding a warning, as shown in the screen below from F-Secure (Obviously I don’t know any dodgy sites!):