Startup Idea : Social Network for Gamers

This idea has been shortlisted for 2nd round of Thiel Fellowship 2015. My idea is about making a common platform for all the gamers of the world where they can share their high scores, tips and tricks, gaming experiences, challenge each other, get to know each other, stay updated about all the latest gaming happenings, gaming competitions, etc.. It's basically like a social network only for gamers. My idea is to cover every type of gamer, be it a hardcore gamer or any casual gamer. I want to spread to gamers of all platforms ranging from PS4/PS3, XBox, Nintendo, PC, to Android, iOS, Windows Phone, etc.. First of all, I want to start the idea as a Smartphone app (iOS, Android, Windows Phone) and a website where users can simply share their high scores (via screenshot as a proof), check Leaderboard, challenge other gamers to beat their score or any other custom challenge, share tips & tricks and get latest gaming world happenings like news etc.. The users will also be able like, comment, and share high scores/challenges posted by other users.