If you have the ability you can do as much as possible, but be careful not to spam the account. I do not encourage you to do much focus on FACEBOOK, you can do Twitter or signature. There are many ways to do this, wish you success.
I'm trying to hold about 20 twitter companies and that's already so damn hard, but i saw a guy who told that he can handle 100 bounties, i'm pretty impressed by that, cause he tells it takes from he don't so much time