don't speak in general :))
I agree that There are many people who are here for other purposes, dating is one of them !
on the other side, all people want to learn even if they are here for learning only or for learning plus something else .
So, choose your language partner clearly .. It's not easy to find your language partner who's similar goals, thoughts, passion and from a suitable time zone ..
I think reading someone's profile and talking with him for some time would help to know his intentions ( not in all cases, absolutely but it help )
Good luck