I've been using the twitter notification widget inside of Scrivener. Project | Show Project Targets | and click the little blue twitter bird. That tweet should populate with # of words as the first word (as configured in the project utility). I select all extraneous info and put a project tag into the tweet. So the tweet looks something like this
Then IFTTT picks up the tweet.
It doesn't run immediately, but it works. I've been looking for a way to automate it more but Scrivener doesn't make it easy to get the word count out in a scriptable way.