If you are a user of Twitch.tv (a live video streaming platform, now owned by Amazon) you will be prompted to change your password the next time you log in. It appears that Twitch may have been hacked, or "there may have been unauthorized access to some Twitch user account information".
Twitch has done the right thing by disabling all current login passwords and have disconnected any linked Youtube or Twitter accounts. You can see their announcement at http://blog.twitch.tv/.

The bigger problem is if you are one of those people that use the same username and password for multiple accounts. Those people need to change all their passwords for those accounts as well just in case the perpetrators try accessing your other accounts.

Once again I encourage everyone to start using unique passwords and a password manager like LastPass.com. For more details regarding online security check out my "Apple Hacked? Change Your Password!" post.
FYI, I have a Twitch account and thankfully I followed my own advice and used a unique password like "&V^A2FgE".