Sharing your video via Facebook is a simple process:
1) Select Edit mode
2) Choose the Group in your Library that contains the video
3) Under the Videos section, highlight your video
4) Under the Share section, select Facebook
5) Decide if you want to Share your video to your Self, All Friends, Friends of Friends, or Everyone.
6) Select either YouTube or Facebook as your Video Provider.
7) Double check that the Name and Description of your video are what you want.
8) After your video encodes, a Facebook Authentication window will appear, where you can enter your Email and Password.
File Size Limit
Facebook has file size limits for uploading video. Typically, 45 Minutes long or 1.75 GB.
See these links for more information: