Facebook Ninja
A Facebook Ninja is someone who adds every single person who sends them a friend request, but then they vanish for weeks. They’re like a friend who only talks to you when they feel like it.
They accept your friend request, but then they never post anything again.
They added 50 people in one day, but then they vanished for two weeks.
They accept your friend request, but then they don’t even comment on your post.