I have not notice if an option exist in the profile page to allow the user to be hidden from other users when he is online. It could be a good addition for privacy that we can find in other forum system.
@j.b.-o. It's in the header profile dropdown. Click on the profile image on the right side of the header. Click on "Invisible" and your status will be hidden.
I want our users to be able to upload their own pics and videos in a gallery on their profile page just like fb profile page, that would be a very cool feature.