Twitch sent out a special notice a few moments ago indicating that there may have been "unauthorized access to some Twitch user account information."
We are writing to let you know that there may have been unauthorized access to some Twitch user account information.

For your protection, we have expired passwords and stream keys and have disconnected accounts from Twitter and YouTube. As a result, you will be prompted to create a new password the next time you attempt to log into your Twitch account.

We also recommend that you change your password at any website where you use the same or a similar password. We will communicate directly with affected users with additional details.

If you haven't already done this in the past 10 minutes (as of this posting), it is strongly advised that you change your passwords and reconnect your accounts to Twitter and YouTube after making that password change.