I guess someone may have the sam experience that can't upload video to facebook. I met this problem and I solve it with the help of a software. Many times, the upload error comes up because the uncompatible video formats. so we should beter convert the video format into mp4 and mov before uploading video to facebook.

You also share video on facebook to everyone by http://www.realsubscriber.com/facebook-shares.html. I used it 6 times and it is great.

The trouble to me is about how to upload M4V videos to Facebook. We know all iTunes M4V videos are combined with fairplay DRM protection, it can be played on Apple devices only. Even you have paid for it, there is no right for you to re-encode or share it to other devices. Now with using DRM Media Converter, you can get rip of DRM protection and convert videos from M4V to MP4 and multiple compatible formats with zero loss quality. After that, you will be able to play all these videos on any devices freely. CLICK HERE to learn its detail functions.