According to several reports this morning, there's been a widespread phishing attack targeting Twitter accounts. One of the company's founders is recommending that users change their passwords to protect their Twitter account.
Note that if you use the same password for other sites, you may want to change those to. I usually recommend that you use a different password for each application so that none of them are shared, that way you don't have to worry about changing all of them if one is compromised.
This touches on one of the points in a recent post of mine, where a URL is sent to a user (in this case a URL purporting to belong to twitter that actually goes to a malware site using the old http://twitter.badsite.com trick) and when the user enters their login information it is harvested. Please be careful when you receive emails with links like this, especially if you're usually logged in to your social networking sites and all of the sudden you are being prompted for your credentials... this should make you suspicious. Sophos is reporting that these types of attacks have been on an upswing lately.
So instead of it being "follow friday" it's "threat tuesday", change your Twitter password today!