This is why I tend to stay neutral on things like this until evidence credible evidence comes out but if it happened to someone I knew personally and god I hope it never does I'd still support them though unless evidence came out that the person I knew was falsifying the claim

The Internet is not a legal court and never intended to be one and judge's must remain impartial and neutral

This doesn't mean you should just deny the claim of someone if they have claimed to he abused online, just stay neutral and give them the resources to report it and get it investigated so it can go to a real legal court