At this point it feels like I was unreasonable to expect people to comment rather than tweet in general, but many thanks to everyone who did comment and give their perspective on this post.

Certainly the effect is more pronounced when I share links via tweet, and since it annoys me so much I think I'll do less of that, I've never automated it anyway (and never would).

I don't think it's appropriate to pull in tweets (it is also a hard problem but that's a separate thing) - if people want to engage, then they can and if not, that's up to them I suppose. I still wish they would though :(