That's a good point. Clearly I still use this platform, but I do see a difference between them.

I don't “post” on Hacker News. I do comment, but I don't think anyone who are interested in following whatever it is that I may have to say would come here to look up my posts.

Or, to put it in another way, if this place would introduce some social media features, such as the ability to follow people and post to followers, then it is highly unlikely that I would be interested in using those features.

I don’t think OP meant “proprietary, closed” as “centralized”. If it’s about the code: https://github.com/arclanguage/anarki

I referred to both, actually. It's about whether I own my own presence on the network.

Of course, I'm not hosting my own server, so I am in some way in the hands of its administrator, just like I was in the hands of Google when I used G+. However, I can talk to him directly, which is a huge benefit. Also, if he decides to shut down the server, I can still join a different instance and reconnect with all the people I was following on the old server.