Is Discord social media?

Social media is a phenomenon so large as to have a myriad different definitions. Therefore, answering a question whether anything is considered a social media platform will depend on the definition you're using.

Discord has evolved from a fairly simple instant messaging and VoIP app into a fully fledged social network the ability to create your own communities. These communities are normally referred to as servers with both text and voice channels dedicated to a wide variety of topics. The servers have their own rulesets, moderators, and content, much like subreddits on Reddit. There, users can meet new friends, network, as well as create, distribute, and share content, ideas, experiences, and other information.