So, is there anyway to check which users did get their 3 free games?

The games won are listed

http://store.steampowered.com/promotion/summer2014faq/

Go to Rewards, then Free Games

6x Dark Souls™ II 4x Wolfenstein: The New Order 3x Child of Light 3x Dead Rising 3 3x Divinity: Original Sin 3x Planetary Annihilation 3x South Park™: The Stick of Truth™ 3x Watch_Dogs™ 2x Dark Souls™ II - Season Pass 2x Killer is Dead - Nightmare Edition 2x NARUTO SHIPPUDEN: Ultimate Ninja STORM 3 Full Burst 2x Papers, Please 2x SPINTIRES™ 2x The Banner Saga 2x The Stomping Land 2x The Witcher® 3: Wild Hunt 2x Thief 2x Valiant Hearts: The Great War™ / Soldats Inconnus : Mémoires de la Grande Guerre™ 7 Days to Die A Wizard's Lizard Age of Wonders III Among the Sleep Arma 3 Assassin’s Creed® IV Black Flag™ Audiosurf 2 Bastion Broforce Call of Duty: Ghosts - Gold Edition Call of Duty® 4: Modern Warfare® Call of Duty®: Black Ops Castle Story Company of Heroes 2 DayZ Deadly Premonition: The Director's Cut Dishonored Don't Starve Eador: Masters of the Broken World Edge of Space Eldritch Endless Legend Folk Tale Galactic Civilizations™ III Grim Dawn Intrusion 2 Jazzpunk Kentucky Route Zero King's Bounty: Warriors of the North Leisure Suit Larry in the Land of the Lounge Lizards: Reloaded Loren The Amazon Princess Murdered: Soul Suspect Nether PAYDAY 2 PAYDAY 2: The Big Bank Heist Planet Explorers Prison Architect RPG Maker VX Ace Rust Shadowrun Returns Sid Meier's Civilization V: Brave New World Space Engineers The Dead Linger Transistor Tropico 5 War of the Vikings Wasteland 2 Digital Deluxe Edition Xenonauts

Are you serious? Can you even imagine what would happen to them? xD

Even without that we often have threads here with people who got added from random people like scammers or beggars. I really think Valve is not that stupid and will show their name in public.