all up in my facebook

When someone likes every status, post and anything you do on fb within 2 minutes of you doing it. They also initiate chat every time you log in. These people may make you not want to post things or be online, because you know they will not leave you alone.

This can be good, in the case of crushes or romantic interests; but can be freaking annoying by others.

Jane: " I think Alberto likes me.."
Denise: "Why do you think so?"
Jane: "He's been all up in my facebook lately."

OR
Pedro: "Man, Kevin is always all up in my facebook, it's so annoying."
Pablo: "Yea, he is online 24/7"