Facebook iPhone Messanger app, what counts as activity? - 1

Sometimes when you click on old conversation with someone it will say something like "active 4 min.ago" or "active 2 hrs.ago". Do you know what counts as activity? I doubt it is actively chatting on facebook as the times would imply that most people are super active in chats, and I don't think that is the case especially with most of my friends on there, so I'm thinking it might be last time they were signed in or something but I don't know.

I discovered a very useful web site which has anything else regarding applications. Perhaps you may try out there, I believe they are going to learn how to help

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