I am been accused of hacking facebook and they are getting aggressive? Please answer?

[TomRobz]

my ex girlfriend is very obsessed and is accusing me of hacking her facebook and creating her a fake facebook and now her father has gotten involved and this is turning nasty i don't trust them and im worried it will get aggressive when i leave college,

Is accusing somebody of hacking and posting on facebook that i hacked them illegal, would this stand in caught if they were to report me for something i didn't do?

[Brandon]

Well since hacking itself is illegal, I'm sure it's illegal to accuse of hacking when they didn't do it.

[Sarky]

It is not illegal to accuse someone of something.
It could be libel if the start posting publicly that you have done so.

[Cassie]

No you won't go to court. They don't have any strong evidence that you hacked into her account. She's just an over dramatic b**ch by the sounds of it.