I have some contacts in facebook that I would like to chat with, but I don't want to import all my Facebook contacts to the N9 (I suppose that option 'all Facebook contacts' does that). I modified the respective contact to have the same email with that he has on fb, but it doesn't get connected. Do you have a suggestion?

Basically I don't know if I described it correctly so I'll try again. In the accounts app, it says chat&contacts and 'only friends in contacts' s selected. How does it recognize which friends I have in contacts?