Can there be more than one BuddyPress community per WPMU/WP30 install?

I noticed this in the BP manual:

Please Note — The BuddyPress plugin only runs on one blog on your site which is normally your main blog.

And that seemed to imply only one blog can have BuddyPress installed. If I want, say, five blogs for five different communities, can each community live in one WPMU installation?

Alternatively, can we have five main blogs, and can all of them share one BuddyPress community?