> "But this aspect isn't basically the issue of publishing? If you post your Facebook status/photos and mark them publicly visible, you're a publisher."

Sure, that's part of it. However, the issue is that Facebook have tried to increase what constitutes public Facebook content over time.

Here are a couple of links about this:

http://mattmckeon.com/facebook-privacy/

https://www.eff.org/en-gb/deeplinks/2010/04/facebook-timelin...

You also have another group of privacy invasions enabled by the phone apps from Facebook:

https://en-gb.facebook.com/help/210676372433246

http://fortune.com/2015/11/09/facebook-photo-scanning/

I'm sure I could find other privacy issues with Facebook. Can you opt-out of all of this? Probably, but it certainly requires vigilance by its users, especially when new features are rolled out.