Facebook - context oblivious censorship on the other hand - reality-bubble forming curator algorithms on the other. Somehow the term "negative feedback loop" comes to mind every time Facebooks mechanisms to filter and market content is brought forth.

I don't think internet search engines should try to be helpful. Guessing what the recipient would like to see removes chance for serendipity and creates and information bubble with a radius given by the algorithms parameters... and then, for what is brought out, they remove the too-saucy bits. This is worse than censorship.