Can someone hack you over facebook?

[stalin12345]

I met this girl on omegle and we were really having a nice conversation so I asked if she wanted to friend each other on facebook. She said yes and only a few minutes afterwards she unfriended me and I can't seem to look her up anymore.

[SimplyAnonymous]

She might of blocked you..

[Parrill Apple]

She might have taken that opportunity to gather all the information she could about you that you only share with friends, then blocked you as that was her goal. She can potentially use that information to try to hack you, but for what gain? It would be a lot of trouble to go through just to vandalize someone's FB. Unless you have an enemy that is particularly motivated to get at you any way they can, I would think this was just a random person who is using Omegle to play a self esteem game in which they see how many people they can get to "friend" them. Sometimes emotionally hurt girls go out of their way to hurt other people (in their own mind at least) to get some sort of generic revenge against guys because of a guy they like who rejected them.
Social engineering is a big boost to hacking someone since many people use their own phone number or a pet's name as part of their password, and feeding this info to a program that is designed to use it and to continuously try to log in can eventually gain access, but also the questions that you can answer to recover your account in case you forget your password are probably the easiest way someone can break in using social engineering.

But there are numerous other reasons why someone might block you mere minutes after friending you. Maybe they saw something on your profile that they disagreed with. Maybe they were younger than they said they were and their parent saw that they were catfishing you and the parent intervened and blocked you for your own good.
Who knows? Everything, even video chat, can be faked online.