Facebook is favouring videos in the newsfeed, so a good length of video to post, which will give you more exposure is 60-90 seconds long. You can feature your business in action, ‘behind the scenes’ or you talking to the camera about special offers. You don’t have to be brilliantly professional.  Just point your smartphone at the action, capture it and post it to your Facebook Page with a relevant caption. Adobe claims that shoppers who view videos are 1.8 X more likely to purchase than non-viewers.