Could just be him trying to say hi - if you want to know for sure simply ask him what he wants then you will know for sure.
Recent Activity means.... what have you done recently in a short period of time
it is a time index of recent activity from a sender and receiver of messages from people over Facebook messenger
He could be flirtting with you.
If your boyfriend blocks you on Facebook it means that he does not want anything to do with you.
It means you ate him.
I think it means 'still for sale'
it means that the person is not actually using facebook at that time they are on a next site but their still signed in facebook
If you mean there chats with other people you need to have acess to their account and can only view recent chats with conversations they have left open. but if you mean conversations you have had with your own friends then you need to open a conversation with them when there online and hope that the chat is still logged.
It means they have customized their privacy settings so you can't see anything they do on facebook, but you are still one of their facebook friends.
It means he's into you.
It means that the person is still logged into Facebook, but is idle (hasn't refreshed the page or made any actions on facebook) in the last 5 minutes or so.
You are doing exactly the same thing, what do you mean by it? The only way to know for sure is to ask him.