It appears that Twitter is now a target:
The micro-blogging service run by Twitter was hit with a series of computer virus attacks that placed unwanted messages on users’ sites over the weekend.
The so-called Mikeyy worm spreads when Twitter users click onto an affected page from a message — or “tweet” — posted by an infected user. They then begin automatically posting tweets to other users that promote the site StalkDaily.com.
The first attack was reported early Saturday morning, followed by two more over the weekend and a fourth on Monday.
This isn’t surprising, really. Any platform that gains popularity is going to invite people to write malicious code. People thought switching to Firefox from IE made them safe but that changed once Firefox gained enough users to make targetting them worthwhile.
One of my home PCs got hit with some sort of worm or trojan yesterday afternoon, although it doesn’t appear to have been this particular one. I did read and send some messages directly from Twitter.com but it may merely be coincidental.