We're still getting DM's from people who are the victim of a recent phishing scam, whereby they inadvertently send out DM's say " hahah This you??" with a link attachment.
Do not click this link, as it takes you to a fake Twitter login page which steals your information (if you type it in!) and then sends the same link to all the people you're following.
If you're the victim of this, we recommend changing your Twitter password immediately, and running an anti-spyware and anti-virus (from a reputable manufacturer) to check that there's no infection on your system.
Please read our Pop Up Scams page to make sure you don't download a rogue fake anti-virus program.
Read our first post about this.
As a side note, if you're running Google Chrome (or possibly Firefox with NoScript, although we've not checked) then this link attack would have been blocked.