In the last few years, we have seen many different types of video formats emerge with the increase of social on mobile. 16:9 was the preferred format when we TV was the dominant force. Now there are several different formats 16:9 (full landscape)
9:16 (full vertical)
9:16 has become so popular that even YouTube adjusted their format earlier this year. Facebook has an online course to show you how best to shoot & use the 9:16 format.