Its true that there are ways to add comments to your site (Disqus being a pretty big one), but you still need to make the time to set it up (and maintain it). There's also the perspective of the one consuming the website content to consider.
Regarding traditional social media, Netvyne at least is not a replacement but rather a tool that can be used in conjunction. It offers reduced friction in the sense that the comment section is there from the start, rather than having to wait for someone to share the page.
The potential for abuse is indeed a big problem, that's why we've built in content moderation from the start. Based on the activity so far, it seems we've got it covered, and we'll be focusing on the other issues as mentioned in this thread, namely marketing and community. If you have any thoughts on how to approach these, I'd love to hear it!
Graffiti is not permitted and will be removed as part of the moderation insofar as it does not contribute to a civil discussion. I am aware of what happened with Dissenter, and I believe that civility is integral to the value that comments bring.