If you want to connect with fellow gamers who are into the same thing, Minimap is a good option for you. It aggregates game accounts from Steam, PlayStation, Xbox and the Epic Store so you can keep track of progress, achievements and friends in one place. Minimap also offers personalized game recommendations and a community of gamers who can share tips and discuss games. The service offers a free version, so you can try it out and join a community of like-minded gamers.
Another choice is Stream, which offers a powerful API for building social networks, activity feeds and chat apps. It's geared more for developers who want to add those features to their apps, but it's a good foundation for building social experiences that can handle a lot of traffic. It's got features like real-time updates, customizable ranking, advanced moderation tools and good security, all of which can be useful for building a community around your favorite games.