I upgraded to 3.7 today and tried to make a post. The post did not show up on Facebook and I tried a couple of test posts as well. I have very few active plugins:
* Jetpack, 2.5
* Akismet, 2.5.9
* User Role Editor, 4.6
Currently using the Koi theme: http://themify.me/themes/koi
I deactivated, reactivated the Jetpack plugin. Re-connected my Facebook account, but nada. This plugin was working as of October 24 (the last post), prior to my upgrading to 3.7.