How many times can someone harass a person on facebook in Alberta before it becomes illegal?

[Cassy]

the situation is my best friends brother beat the living hell out of her, so I sent him a message on facebook telling him if he ever laid his hands on her again I'd call the cops on him, and he sent me a message back saying if I sent him one more message to him I'd get charged with harassment.

soo, just wondering how much trouble I'd get in if I sent him one more message?

[April]

He should have the cops called on him and she would be the one to do that. He'd be an idiot to call the cops on you for 2 messages, because if, by some miracle, the cops are bored that day and have nothing better to do, they may contact you, then you can tell them he beat up someone. Sounds like a bunch of childish crap to me.