how to tell who someone has been talking to on fb?

[fourty]

is it just the faces on the friends thumbnail under the name?

[Zerostar]

Yes

[nastassja bentley]

I don't think that's always who they've been talking to, because I have some people there i've not chatted with, but who's posts i've liked and who likes my posts etc. Also if you have mutual friends or people who they're friends with who's profiles you've recently viewed, sometimes it shows them

[Daniel]

If you Mean In Messages If So You Cant Tell Because Thats Private Only That Person Would Know

if you Mean Wall Posts You Can Tell By Visiting There Facebook Profile