Earlier today, several Twitter users received emails from Twitter prompting them to change their passwords because of suspicious activity that appeared to have resulted from phishing. Turns out it was something different from a traditional phishing scam altogether, and it involved BitTorrent.
From the Twitter Status blog:
It appears that for a number of years, a person has been creating torrent sites that require a login and password as well as creating forums set up for torrent site usage and then selling these purportedly well-crafted sites and forums to other people innocently looking to start a download site of their very own. However, these sites came with a little extra - security exploits and backdoors throughout the system. This person then waited for the forums and sites to get popular and then used those exploits to get access to the username, email address, and password of every person who had signed up. Additional exploits to gain admin root on forums that weren't created by this person also appear to have been utilized; in some instances, the exploit involved redirecting attempts to access the forums to another site that would request log-in information. This information was then used to attempt to gain access to third party sites like Twitter.
Yet again a good reminder to choose strong (and different) passwords for each site.