Raptr

Raptr addresses video gamers around the world no matter their gaming platform. Raptr presents clients for many accounts including Steam, Xbox Live, PlayStation Network and even Yahoo!, Google, Live, AIM, ICQ or Facebook.
This way, Raptr benefits for easy connections and a wide array of options you can use to make it your number one favorite gaming-related social network. With Raptr, you are guaranteed to find at least one other fan of the games you love to play.
As of September 2013, Raptr has eighteen million users and has also partnered with Activision and Gamespot and started to feature in the installers of many PC releases such as Red Faction: Guerilla or Guardians of the Middle-earth.
Being a Raptr user allows you to build your gamer reputation by unlocking achievements as you play your favorite games and watch your progress while also comparing it to your friends, earn rewards as well as share your best moments that you captured in still pictures or even videos.
Raptr also drags all of your social accounts under the same roof be connecting to your Facebook, Twitter and even YouTube accounts so you can easily access them while in the game. With Raptr, you can also view what games your friends are playing, just like in other popular clients such as Steam, Origin or Uplay.
To sum it all up, Raptr is quite well-known in the gaming community, with a decent number of users, although it is far from Steam, Xbox Live or PlayStation Network. It acts like a hub, though and allows people from different gaming platform come together and enjoy great multiplayer games while they also capture the bits and pieces that matter the most.