Nabble forums now show which users are online. This information is displayed as a green circle on the bottom right corner of the user avatar. Example:
* Online users are forum specific. If you participate in two forums and are currently visiting just one of them, you will be displayed online ONLY in that particular forum. Users on the other forum won't see you online.
* A user is displayed online if he/she has visited the forum in the last 5 minutes.