Now that WordPress’ built-in publicizing function works with Google+, it’s an obvious way to hit all social networks at once. However I found out that one of my existing plugins was messing with specifically publication to Facebook. And since a lot of my social interaction comes via Facebook, this was a problem.
I traced the issue down to Yoast’s WordPress SEO plugin, which has an option to turn on Open Graph meta data under it’s social settings. I’d disabled this because previous versions of the WordPress Publicize plugin (or perhaps Yoast’s) had fought about what tags to throw in there, resulting in Facebook not showing anything. Apparently the situation is now reversed, and you DO want to turn the option on.
After turning it back on, my posts now flow to all my networks, including Facebook!
Hopefully this helps someone – I spent a few hours working on finding exactly where the problem was!