I quite like the game, but it is very easy to cheat the system. You can just make up a result at any level and get it verified. I wanted to tell you before but wasn't sure how.
I am pretty sure I figured out the exploit and I am by no means a proper hacker. I think you should stop the posting and liking until you embedded the rewarding system deeper into the app. Make the game server controlled, rather then client controlled. I may be able to help you ab bit with this, if you like. Send my a (encrypted) message or write me a comment if you like.