If you use Myspace, you need to be extremely careful at the moment.

First we had Zango Adware being pushed from profiles encouraging other users to spread the same content.

Then, we had a "Myspace Toolbar".

Now, there is talk of an exploit that relies on redirects via Flash, meaning the hacker has complete control over your profile. You can see the ripples being made here on Digg - should be interesting to see if Myspace put out some kind of "official response" to this one as it's really caught fire. Of course, there have been exploits floating round Myspace for a long time...but as always, don't let familiarity breed contempt - here's a nasty example of what can go wrong for the non-cautious individual!