I uploaded this video
long time ago but I forgot to inform about it. This video is about the Mulitplayer First Person Shooter game I made with Unity by following a tutorial series on YouTube. This video is quite old because it doesn't the contain player spine rotation of other players being displayed, which I added recently (Other players are displayed as full model). What I basically do is I send the current rotation of my (first person) camera to all other players and they interpolate my rotation (of spine) in their world from the current rotation of my player's spine in their world to the rotation I send them. After that, the client to which the rotation is sent sets the value of x and z axis' rotation to zero because it would then otherwise mess up (I hope you understood what I said). I will soon upload a new video of this and maybe I'll release the source code of it too.
Also can be found on my blog