There's an app for saying "I told you so"
 

If you're the sort of person who relishes bellowing "I told you so!" into other people's faces then, congratulations, you're an asshole. You're also the prime target for an app called IKI (I Knew It) that aims to take the lowest form of douchebaggery...

http://www.engadget.com/2016/04/08/i...edictions-app/