Twitch: What can friends do?

Re
- in Twitch
2

I have discovered Twitch for a few weeks now and have also had some friend requests. But I wonder what such friendship entails.
I don't want people to see who I'm following or anything private, let alone the accounts I've linked to Twitch or anything.
I don't really know people personally, only because you meet regularly in chat. Hence the question: What can friends do on Twitch, what information do they have about me and what can they access with me?

Ro

Chat with each other

Re

Just?