Buddypress, Classifieds, & Directory

On a Multisite, does Buddypress need to be activated site-wide? When I had it activated site-wide and I tried to used the Directory and Classifieds plugins on subsites of my network, the short code buttons would keep sending me back to the main site of the network. However, when I deactivated Buddypress, the plugins worked fine. I found that I can activate Buddypress on just my main site and everything seems to be working fine, but I can't find documentation that verifies that Buddypress doesn't need to be activated network-wide to work properly. Can you confirm this for me?

Thank you.