I know where someone works (*same place as me), the city they live in, and their possibly-inactive Facebook account (tried messaging them, nothing). I don't know what it is, but I know they have a Twitch account. How can I possibly find another account of theirs to contact them with?

inb4 I'm trying to doxx, I dont want them doxxed. (*Not supposed to be contacting them at work - we work in completely different areas of the facility now too.)