Since you are talking specifically about altering how WPMU deals with blogs, I’d suggest posting this question on the WPMU forums so that their gurus can answer. Whereas you might receive an answer on the BuddyPress forums, the WPMU forums is the more appropriate place for such questions.
I advise that you first do a through search of the Mu forums before posting.
https://mu.wordpress.org/forums/
This is a WPMU issue and not a BuddyPress-related one.
There are some great WPMU plugins by dsader that limit the WordPress backend:
http://wpmudev.org/user/56/
I suggest checking those out.
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[EDIT]
Just read over your post again and you say you want to eliminate the entire backend? Off the top of my head, I don’t know if that’s possible.
I don’t think anyone has attempted this in BuddyPress yet, but I could be wrong.
Just read over your post again and you say you want to eliminate the entire backend? Off the top of my head, I don’t know if that’s possible.
Best way to do this would be to integrate the P2 theme into your user blogs.
Otherwise, I know there is a WPMU plugin out there to help limit the admin side bar’s available links. If you manually navigate to the page you can still get to them, but it hides the options from view.
Best way to do this would be to integrate the P2 theme into your user blogs.
Ahh yes! Totally forgot about the P2 theme, John!
https://wordpress.org/extend/themes/p2
I forget if P2 puts a character limit on post entries like Twitter.
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Also I did some digging just now and the WPMU plugin that John and I are talking about is the “Menus” plugin by dsader:
http://wpmudev.org/project/Menus