By "~public" I mean stuff that isn't hidden selectively (like you need to be friends to read the feed). So they're just hidden behind a simple-login so facebook

By "~public" I mean stuff that isn't hidden selectively (like you need to be friends to read the feed). So they're just hidden behind a simple-login so facebook has all the data and you can't use a search-engine to search all sites. And everything on facebook is behind a login.