Facebook Ninja
Main Entry: 1ninja(Past ninja-ed, Present ninja-ing, 3rd person present singular ninja-s)
Pronunciation: nin’ja
Function: Verb
Etymology: Sino-Japanese reading of Shinobi, meaning to steal away.

1 : To lurk in the shadows of facebook, stealthily accessing embarrassing notes and wall posts.
2 : A less creepy way of saying stalk or lurk.

The dawn of the 21st century saw the emergence of one of the creepiest inventions known to man; Social networking. So creepy, in fact, that on a top 10 list of Creepiest Things in the World, it would probably sit steadfast in number 3. Behind Japanese adult toys and giant pillows with naked anime characters on them.
Sam: What are you up to?
John: Oh, nothing, just ninjaing on facebook.
Sam: Damn I should have known you are the Facebook Ninja!