Twitter: the popular microblogging site, was hit by hackers and 33 high profile accounts including that of Rick Sanchez and Barack Obama was compromised. The attack just followed last weekend phishing attack on website. Hackers were able to get into the back end admin tools that twitter team uses to manage profiles of different people.
Soon after the attack twitter shut down the admin tools and recovered the hacked profiles.
Source: http://blog.twitter.com/2009/01/monday-morning-madness.html