And there's a beautiful little tool named Bridgy that can pull replies/mentions off Twitter and Facebook and turn them into Indieweb-able entities. It's all really quite great, but of course assumes the terrible, terrible inconvenience of running your own website.
Bridgy is only able to see the comments one's social media account, like one's Facebook account, gets notified about, right? If some to me complete strangers start talking on FB about a post I made, I won't get to know about that via Bridgy? But if some friends of mine, whose comments my FB connected Bridgy account gets notified about, start talking about the blog post, Bridgy detects that?
You can see it in action on this page : https://aaronparecki.com/oauth-2-simplified/