We all Facebook stalk. It's just a thing we do. But Facebook stalking isn't just for that guy or girl you're hoping to date - there's a whole slew of different reasons to stalk:
1. The classic "I have a crush on you so I'm going to look at every photo of you from today back to when Facebook began even if it takes all damn night"
2. The "you look like you got plastic surgery and I'm going to go back through your photos to find out when the drastic change occurred and how long you've successfully hidden it" - the best is when you find conclusive proof and show your friends how great you are at sleuthing.
3. Everybody's favorite "who the hell is that girl/guy in your photo and are you dating them?" Why do you have no relationship status up? She's not in your profile pic, she can't be that important. Maybe she's just a coworker but I'll be damned if I don't find out more.
4. "Are you pregnant or have you just gained weight?" The key for this one is looking for alcohol in photos - is she the only one without wine in that girl's night photo? Bottle of water at a music fest when everyone else has beers? Preggo, for sure.
5. "You blatantly photoshop every picture you post of yourself so I'm going to find one you're tagged in by someone else and figure out what you REALLY look like." Inches off the waist? Hair longer? Eyes that are a cartoonish color of blue? I haven't seen you in years but I'm going to find out what you're hiding.
6. The "very subtle name change (i.e. from Sally Jones to Sally Marie with no last name) and many recent pictures alone that seem to indicate you got divorced" - of course you have to go see if they still have their wedding album in their photos, that's the key.
7. "We just started dating and I want to see if you're a complete psychopath/who my competition is/if you're a raging alcoholic/etc" Hmm, so you dated that girl in 2009, she's only a 6. How come every pic of you has beer in it? Why do you have a beer in your hand at a baby shower? Maybe that's a red flag, combined with the picture of you passed out with a penis drawn on your face and the one where you can see how nasty your apartment is in the background...