Google Is Rolling Out the Ability to Install Apps Directly from Search Results (androidpolice.com)

wonder if that only works on google search and what about if I share link on facebook will it auto download?

Yeah, like who wouldn't expect that, let's see, first they penalize sites that ask you to download an app (http://fortune.com/2015/09/02/google-mobile-web-ads/) and now they offer to do the download for you.

Of course the App owners pay a bounty to the person who gets you to download the App so people like Quixey who made money of this while Google captures that revenue for themselves (after all its just "ad revenue" right?)

It is a pretty egregious use of the search rank system in order to further the commercial interests of Google.