I want you to comment on this post, giving three clues to the identity of someone else, mutual friends to both of us.
That is, someone who is on both your friends list and mine, and who has both of us on their friends list.
There's no need to be anonymous, and so if you want to post this meme yourself it'll still work in a friends-locked post.
Obviously, no naughty revealing of secrets, no sensitive information, nothing that the other person wouldn't want you to say. Just a bit of fun.
I'll try and guess who you were talking about.