Is it safe to download videos posted on my FB wall?

Ok heres the skinny on Facebook videos anytime you have to like or share a video you are essentially giving the originator of the video the rights to page watch your facebook page . example say its a video about food now you have given them the exclusive rights to steer you toward pages they want you to see that may or may not be safe and secure . Anytime a video warning pops up that says that you should be thinking twice about liking or sharing or downloading that video its trying to tell you that its not safe or secure and could also dump malware on you . Facebooks revenue is based on people liking and sharing videos and revenues because some of the content is paid for by those wishing you to click that like button they pay FB for the right to give you access to show you things FB does not care if its an infected file only if its vulgar or in bad tatse such as pornography . Use caution