GRAPEVINE, Texas & SAN FRANCISCO—Today, GameStop Corp. (NYSE: GME), the world’s largest multichannel video game retailer, has selected Adgregate Markets, the leader in secure social commerce solutions, to provide social shopping on its Facebook page through Adgregate’s proprietary ShopFans™ solution. GameStop, which is ranked #115 on Internet Retailer’s Top 500 List and 3rd in the sub-category of Toys/Hobbies, is the first multichannel....