He proves a point and establishes a market by showing a google search query. I don't think this is valuable since we all know Google is building up your personal filter bubble. Therefore it's quite logic he gets suggestions for unprotected tweets, he's already investigating in that field. I don't get these results. But this might change now that i read his article and composed a comment on that matter.

Doing a google search is not a proof for anything anymore, because they are perfectly tailored for you. I wonder why people still do it.

Twitter is not meant for protected accounts, rather for broadcast. Such users are far too less. Perhaps they are so dumb (to have protected tweets) that they deserved to be looked at, so that they can run away to their facebook where they must've originally come from.

The same thing can be built for facebook, though.

Next: facebook 'private' photos

This would probably be legally easier. As long as you have the URL you can access them, so you are more of a directory than a provider of the data.

E.g. https://www.google.com/search?q=hphotos-ak-frc1

tl;dr - nothing on the web is private.