This leads to some perverse incentives, though...I have started to see like-farming "tag your friends" pages will post a video of a static image, overlaid with

This leads to some perverse incentives, though...I have started to see like-farming "tag your friends" pages will post a video of a static image, overlaid with a subtle movement effect like falling snow, undoubtedly because someone realized they'll get more eyeballs from the all-knowing News Feed algorithm if their content is video.