We have an answer to this, in the shape of the
This makes it possible for posts on other sites to notify you when they have commented on an article of yours, through a simple protocol.
I know this sounds like development work, but there are a couple of services that implement this with small changes to your site's markup.
In addition, there is a service brid.gy that will map twitter, facebook, g+, instagram posts into webmentions so you see those too, if you want.
For an example post with a lot of comments received this way, see
I'd be happy to chat more - come on over to
or track me down elsewhere.