(adsbygoogle = window.adsbygoogle || []).push({}); Twitch has posted on their official blog saying the company and therefore site has suffered from an attack.
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Users are required to reset their passwords on sign in.
Company is in the process of contacting users who have been impacted.

Not much else to say apart from don't use the same password for every site.

Hope I'm not affected

I'm not affected

Needless to say I was impacted. I actually received an email from Twitch this morning and went through the process of changing my password and so forth. I believe Twitch integrated Authy -- which I've used for years now and highly recommend -- so I might go ahead and set that up.

Edit: I stand corrected, from my brief understanding of Twitch, it sounds like there isn't 2FA/DFA for the general userbase.

Every user password was reset with some users getting a follow up emails. Changed the password and still going to carry on using the service.