Actually, considering that you have 13 people added, just set it to 6+, then, in your profile, set your friends list to 'middle' and then click save setting in the top left. Then you can see their last seen, last post, status, and birthday.

It takes a bit of time, but if you have a lot of friend slot or not too many friends, you can check. For now I haven't voted, I may later though.
