Good but won't post to Facebook! – Interval Run Review

I really like this interval app. I've used it to, er, restart my running habit just about every year after I inevitably fall off the wagon. I like the simplicity of it, and the directness of the spoken instructions during a run - nothing gimmicky, just a direction. My only criticism is that it never allows me to post to Facebook! I have uninstalled and reinstalled the app multiple times, and it still won't post! I don't know what's wrong, but it has been a problem since I first downloaded the app in 2012...
Review by marmoo on Interval Run.