In the comments from my previous post about cross-posting from Dreamwidth to FB and TW, laurion recommended trying Zapier. At the time, I said that it wasn't worth the effort -- that using Zapier in a straightforward way didn't produce any better results than dlvr.it, which is easier to use.
Problem is, that was basically accepting a mediocre solution, and the engineer in me rebelled. In particular, just judging from "likes" on FB, people are reading my direct status updates there, but most probably aren't actually following through to read the links. So what I really want is to repost the text of my post here over there. The only difficulty is that what you have available is either the raw HTML of the post (which looks like crap on FB), or the completely-stripped version (which drops all the links, formatting, and so on). Both are kind of ugly.
Of course, there's a catch (which I didn't figure out until I had all of this working): Zapier's Free plan doesn't include "multi-step Zaps", and as far as I can tell you have to have multiple steps in order to make this work. And their Basic plan is insanely expensive for personal use ($20/month). My solution seems to be working, but I'm still in the "trial" period, and I suspect they're lying to me about the claim that I'm currently on the Free plan. I would bet that, during the trial, I'm secretly upgraded to a higher level, and once the trial is over, they'll tell me I can't use this Zap unless I pay them a fortune.