UPDATED VIDEO : goo.gl/nFYsCM
Yey ..its my first tutorial Easy way to download Facebook videos on your android phone .. :)
1.download ADM (advanced download manager )from play store ..
2.go to Facebook search the video which you want ...
Click "v" arrow to save the video..
3.go to save folder on your profile .tap on the centre of the saved link...
4.pop up will come when you click on the link..just select ADM and start to download..