[iamdave]

Actually, Facebook used to have privacy sliders exactly like this back in late 2007, early 2008. I think there were only three of them: profile, user info and pages.

[hamstersoup]

I had forgotten the sliders: http://www.designaesthetic.com/2007/07/17/facebooks-ridiculo...

I don't think they were a privacy control, just a (complex) way of mixing your newsfeed.