The scuttlebutt on Twitter is that a wide range of user accounts have been hacked and are spewing out enticing direct messages. Here's one I received, which -- full frontal admission -- I clicked on.
If you clicked on one of these direct message links, change your Twitter password immediately.
If you have not clicked on one yet, ignore them all.
Make sure your anti-virus, host intrusion prevention and/or other endpoint protection mechanisms are in place. If you surf using Internet Explorer, it's highly likely you are at risk. In that case, Download Firefox immediately and use it -- in all cases -- as a replacement for IE.
More updates as events warrant.