1 definition by Drewanium
Someone skilled in the art of shadow netting; Appearing in facebook messages or pictures without owning an account. A Facebook Ninja can never be "tagged" and never appears on a wall. Therefore, they are one with the shadows of the internet and are needless of an account.
"Drew should just get an account already so I can write on his wall!" "He doesn't need to, he is a facebook ninja..."
by Drewanium February 22, 2008