Facebook Ninja
A Facebook Ninja is someone who haunts your messages and photos like a ghost, but you can never catch them. They don’t have an account and never show up when you tag them. They’re like the internet’s version of a ghost.
You see your ex in a group chat, but they don’t have a profile picture.
You post a photo and your mom is in it, but she didn’t tag herself.
Your crush is in your friend list, but they never post anything.