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?

Thanks!