What is Facebook Ninja?
1.
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..."
See
2.
One who is active within the realm of Facebook but never allows him or herself to be seen as "online"
Notifications - John Doe commented on your status. < one minute ago
Online Friends (0)
"John Doe is such a facebook ninja!"
See