Limit of facebook group joining.

Is there any limit of facebook group joining ? How much group I can join ?
( Sorry for small knowledge of English ).

I don't think there's a limit to the amount of groups but I do think there are triggers in place resulting in a block/ban for unusual behaviour (for instance too many joins in a short period or whatever). But I'd love to hear if someone knows the exact rules and limits

I have accounts that joined over 700 groups. I don't think there's a limit though. But spread it for days, you'll not be able to post to all of them in a short time.