What do you think of this kind of Facebook profile?

[Doooorah]

If you know someone in person, maybe not too well, and if you saw that their Facebook profile is completely empty (no wall posts, no photos, not even a profile pic), what would you think of them? That they're boring? Serious? Weird? That they dislike Facebook and only use it for communication?
Honestly I just wanna find out what do people think of someone based on what they (don't) see on their Facebook profile.

[Lavin]

i personally dont think anything wrong of them
just that they probably dont like to share their personal life
true facebook

[Angeleyes]

Some people like to keep their profile private so, they don't show a picture, there's nothing wrong with that.