This article is interesting (there a discussion on HN somewhere): http://www.bloomberg.com/features/2016-how-to-hack-an-election/ http://www.bloomberg.com/featu

This article is interesting (there a discussion on HN somewhere): http://www.bloomberg.com/features/2016-how-to-hack-an-election/ http://www.bloomberg.com/features/2016-how-to-hack-an-electi... Anecdotally, through ~2009/11 you could use keyword density as a significant ranking variable on the Google Play store. I was amazed when I discovered as web SEO had long left this behind. I had an app coming up 3rd in searches for things like FB and YT.