I was *just* about to post about the same thing. I think that the problem beginning coincided with the most recent WP update but I can't be 100% sure - I know I updated JetPack in the last couple of days also.
My symptoms are the exact same as wellnessfight has listed above.
I've cleanly removed and then re-added my link to facebook (I don't "publicize" to Twitter) and that has not helped.