(Paul just posted this on his blog, and I am reposting it with his permission so we can get the info out. )
Sara just spotted what appears to be hacking of twitter accounts. Check out these screengrabs of @bobbyzeez and @BabyPatches.
As you can see a twitter search for the term “mikey” is displaying a huge number of accounts being compromised that is increasing very very rapidly.
My advice for now, is to sign out of the web interface, change your password and see what happens.
UPDATE: 17th April 20:49
It appears that this is a resurgence of the Mikeyy worm from last week (albeit with somewhat different output! See this mashable post for details of how to deal with it.