WP/BP/MU multi communities ¿?

Is it possible to let members in a WP/BP/MU create their own communities? Example: when they create a new site, can they use the BuddyPress Default Theme and have their own members, groups, activity, etc within their site which separated from my main site?

I ask because I tried with http://linkedbees.com/network and it doesn´t take the BuddyBar correctly and in the BP functionality it shows "page not found" all the time...

I know there is a WP-Multi-Network Plugin, but I think it is for something else...

thx for the support, Donald.