BuddyPress.org

@Timschmi

No, there is not a facility for hiding your online status from the rest of the site. That feature is really not necessary as the privacy settings will allow you to block all communication for a single user all the way up to all users. So, what difference does it make if someone knows that you are currently online.

As a side thought, this Site ( BP.org ), uses the “Recently Active” widget instead of the “Who’s Online” avatar listing. I think this makes more sense as it does not indicate if someone is currently online. It is simply a listing of the most recently active members.