(adv.) When you get recognized by someone you don't know that has seen you on Facebook. It often creates that uncomfortable moment while you stand there trying to figure out how you know a 47 year old balding computer nerd with carpal tunnel.
If you're walking down the street and some nutbag that you have never seen in your life says, "Hey don't I know you?" ....
you have just been 'Faced'.
Not to be confused by 'Spaced' which is the act of being hit on while using the internet, by teenagers claiming to be 21.