i used to have a lot of very close online friends but now i only have a handful and i would only consider myself close to one of them, maybe two
i trust the ones i'm close with and i generally trust all the others too, but at the same time i like to keep my personal life and my online life totally separate so i don't add people on facebook etc
if I think of someone as my friend ofc i have some measure of trust in them, i haven't always been right to trust my online friends in the past but I have a few now I would trust with my power of attorney.