While a group hasn’t taken direct responsiblity for the hacking of Twitter on December 17th, 2009, it is clear that it is a pro-Iran group. Techcrunch postulates that these incidents will be fewer and further between with the hiring of new security experts and engineers at Twitter.
Given its participatory nature, Twitter will always be a target of hackers. While the attempt could have been made by a pro-Iran cabal, it could have just as easily been any number of groups that may try to galvanize the other side of the issue with such an action. Who knows.
For me the big takeaway was that if you use your Twitter password for other accounts, now would be the time to change that password on those other accounts and Twitter. It took me a few minutes, but it is possible that it saved me a world of grief. I advise all of my clients and friends to do the same.