Twitter Spam: new headache for the social nedia user?

I don't know about you but my Junk email file has been substantially smaller the last months. Busting some mafia email spam networks seems to be the reason for this but I suspect that the email spam aficionados realize that email spam finds itself in the decline stage of its life cycle. A new form of spam seems to be emerging though. Counting on the increasing popularity of the social media the spammers try now to use these as spam platforms. Twitter spam seems to be the new emerging headache for Twitter users; this takes sometimes very subtle and sophisticated forms. Do we now need a Twitter spam filter? An interesting post in WIRED