You post it, people will see it.

If you post something on facebook (pictures, status', etc), it is for your friends to see. And if you post something as public, anybody can look at it. Therefore when someone you know comments about what you posted on facebook, you can't say, "That's creepy." STOP. Stop saying that. Same with instagram. Facebook is set up so that you can find people even if you only know their first name and one other thing about them - their search engine has increased a lot - so it's easy to find most people. It's not like you sit and look through every person named Katie who lives in Georgia if you're looking for someone. And oh, did you forget that every thing you ever posted on facebook is available to your friends? All the way back to whenever you got a facebook, like 2006? Every person you dated who wrote on your wall, all the status' you posted, all the pictures you posted... it can all be retrieved by whoever you are "friends" with... those 500+ people you've met in life. Yes, it's silly to have someone go back through it, but you know, some people are bored or like looking at old pictures you've posted or whatever... or maybe they're just interested in your life... they have access to that because you put it on there. So get over it, or start deleting more stuff and filtering what you post. The internet is full of everything you've posted so quit acting surprised when someone sees it.