After moving your mouse pointer on a BuddyPress user avatar (or clicking) you will see a bubble with the defined by admin information about this user.
Yes, it does. No need to wait until page will be loaded.
Yes, I think no need to add such functionality to users links or groups avatar.
Are you using it on a live site? If not, there might be problems, because I didn't tested in Denwer, WAMP or LAMP. Try it live. Try to reinstall the plugin too.
Requires: WordPress 3.2 and BuddyPress 1.5 or higher
Compatible up to: WordPress 3.5 and BuddyPress 1.6.2
Last Updated: 11 months ago
Active Installs: 800+
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