I would like our "sites" as they are called to have the ability to be listed on Google or not.

At present they are listed on google see -

ATHK on google

Second hit

or - Lummox JR on google (Apparently Lummox JR is a creature)

Not to mention that this page shows every single post you have made, it wouldn't take a bot long to search each of those posts for an @ symbol and grab that email address to commence spamming.

It's hardly a big ask, as you have hidden copyrighted material from Google, I'm sure you can implement a check box to do the same for members.

You could even take the approach many forums use by still listing the account but showing an error such as "you have to be logged in to see this profile" when they view the said profile.

[EDIT] to also add to this a simple site:http://www.byond.com/members Will show all accounts anyhow.