A moment in life or on webcam that something funny or interesting happens to a friend or lover that you feel all your facebook friends NEED to know. (ie. embarrassing moment, accident, personal matters) That you post on your wall on Facebook
I made a faceplant last week and my bestfriend decided it was a facebook moment. Now people make fun of me for it!
My girlfriend did a booby dance last night. It was a total Facebook moment!
An event in which somebody nearby had a camera phone, captured a unique and most often embarrassing moment and then promptly uploaded it to their Facebook profile.
Example: Your best friend passed out at a party, so everyone decided to draw pictures on his face and wrap him in saran wrap. Being the good friend that you are, you captured that Facebook Moment by snapping a photo of him on your camera phone and then posted it on your Facebook profile long before your friend woke up.