We've added code to reduce the size of the Facebook course object for very long tracks. It's now 4 times smaller than before. Can you please try to publish the ultra marathon track to Facebook again? (I would try it myself but I don't have such a large track :-)
I think I have found the problem in our server logs:
2014-07-06 16:11 [warning] {facebook} Facebook: postFitnessAction: returned error: Object at URL 'http://www.rungps.net/facebook/services/courseObject.jsp?trainingID=1427725' of type 'website' is invalid because a required property 'og:title' of type 'string' was not provided., error type: Exception,
My suspicion is that this training does not get published because it runs into a timeout since the data is so extremely large. I'll investigate and post the results here.
Since the beginning of july run.gps facebook app stopped to publish trainnings to facebook finess. I can't also to publish it manually. Reinstalling run.gps facebook app didn't helped.