So your wondering what is Koobface. Well Koobface is a Malware program. What is does is monitors for when a person logs into their twitter account. It will send out messages that has a link in it for them to click. Here is the kicker because twitter uses a service to shorten the URLs you really don't know what you are clicking on. Ppl will then click the link only to get infected with koobface which then infects the persons pc.

Koobface is not only plaguing twitter but has also been found on facebook, myspace and many other social sites. With twitter it just makes it harder because you cant simply hover over the link to see where it really goes. When you hover you only see the shorten URL and not the real link because the shorten URL is a redirect so really you have no idea where you are going to go. You can see on my Twitter what I'm talking about. When I hover the mouse over the shorten URL is still shows me the shorten URL below. I have no way to check to see what the real URL is.

Now if you use tweetdeck from what I have heard they will show you the full URL. I had to google to see what tweetdeck was and this is what I found at tweetdeck.com TweetDeck is your personal browser for staying in touch with what's happening now, connecting you with your contacts across Twitter, Facebook and more.

Oh yeah that is what I need another browser I will say this has made me think twice before clicking on any link on twitter without verifying it first. Now twitter is well aware of this issue and it trying their best to stop it. They are currently suspending accounts that have been effected. You can read more about it here

Twitter Suspends Accounts of Users With Infected Computers

At least a couple hundred accounts have been infected by Koobface's latest efforts, according to Ryan Flores, an advanced threats researcher, writing on Trend's blog. When it made its first appearance a couple of weeks ago on Twitter, Koobface was just sending out three shortened URLs (Uniform Resource Locators) leading to Malware. Flores wrote that Koobface is sending out more bad links this time around.

Some of Koobface's bad links have advertised, for example, videos of Michael Jackson, where the Malware writers are trying to pique people's interest in current news events, said Graham Cluley, senior technology consultant for Sophos. If a person followed the link, it would lead to a Web site asking the user to download an upgrade for their Flash multimedia players but is actually Koobface, he said.

But Twitter has been fairly quick at shutting down accounts of people who are infected with Koobface and resetting their passwords, Cluley said.