In a world before social media, a lot of online communities existed around blog comments. The particular community I was part of – web standards – was all built up around the personal websites of those involved.
As social media sites gained traction, those communities moved away from blog commenting systems. Instead of reacting to a post underneath the post, most people will now react with a URL someplace else. That might be a tweet, a Reddit post, a Facebook emission, basically anywhere that combines an audience with the ability to comment on a URL.