Inbox Facebook "seen" question?

[Jess cool]

Actually someone in my friends list posted that to "unsee" the message, you can probably "unsee" on the friend's side too. So try to unread message and see whether that works. I do not know whether it does, but sometimes I do that and that person does not inbox me about why I didn't reply when I saw it. They also probably have to know that maybe you're busy. So you could also say "Very busy right now, talk later" as an alternative.