Like-minded gamers can socialize online. Do you want to meet other gamers?
Chat with like-minded gamers and share memes with them.
Reddit is a hub of independent communities, called subreddits. Subreddits are user-driven: anyone can create a subreddit whenever they want. Each subreddit is run by different moderators, and the quality of a subreddit often depends on who's running it. Certain games may have multiple subreddits for different purposes. For example, Overwatch has a "main" r/Overwatch subreddit where most of the general chatter happens, but also an r/OverwatchUniversity subreddit where players can learn more about the game and improve their techniques. Generally speaking, smaller subreddits are more pleasant. The default r/Gaming subreddit, for instance, has a massive community, and is full of low-effort posts and memes. Still, it's a good place to start before you delve deeper into your subreddits of choice.
Discord
If you're a gamer who has never used Discord before, you're in for a treat! Discord is a way to get tapped into a community and make new friends. By now, every game has at least one Discord server where players congregate. This makes it a fantastic way to find others who are into the same games as you are. This wonderful app is a text/voice/video chat tool all wrapped up in one, making it a fantastic form of social media for gamers. Anyone can learn how to set up a Discord server and each server can have as many chat channels as the server owner wants. Text channels are basically chatrooms, while voice channels are reminiscent of older apps like TeamSpeak, Mumble, and Ventrilo.
Steam
Steam is essentially a gaming social media site. Each individual game has a community hub where you can keep up with news about the game, take part in user-created discussion threads, participate in group chats, share screenshots and videos, and even write guides. When you've found friends through the community hub, or possibly in the game itself, you can add them as friends and keep up with each other on your Activity Feeds. You can also create customized profiles, leave comments on each other's profiles, create private or public groups where members can post threads, chat in real-time, and play games together.
Twitch
Twitch has revolutionized the gaming landscape. It's a video streaming site that provides a platform where anyone can stream their gaming sessions in real-time, allowing others to tune in and watch them at their leisure. Twitch is anything but "just" a streaming site. Entire communities can (and often do) build up around specific personalities and organizations, similar to what we've seen happen on YouTube. And because every stream has a chat beside it, fans can converse with one another while watching streamers play their games. In this way, Twitch is very much the next big social networking site. You can add friends, send whispers, and follow streamers---but that's just the start of it. Twitch regularly adds new features to aid in socialization. These days, Twitch is vital for social gamers. Many streamers supplement their stream with their own Discord servers, so you'll likely have to use both to get fully tapped in.