Facebook/computer hacking?

No, they aren't gone forever. Facebook is notorious for keeping data for as long as they possibly can, even if a user "deletes" them.

But no, you don't really need to worry about them being compromised. You gotta remember facebook is a big company and they have a whole team of very smart people whose entire job is making sure that nobody breaks into the FB servers.

Change your password just invade if you clicked on a link by mistake it could have been hacked, I got hacked recently and had to change my password, you can always lock Facebook it keeps hackers out then you can get on a computer in the privacy of your own home and unlock it, so you can put a new password and put a safe device they give you on Facebook when you unlock it, so you can be informed if someone has hacked you from an unknown device, also make sure no one has your Email that's another way they can figure out your password, but sometimes Facebook is just acting up.

Only way to access them would be from Facebook servers.