On the Internet, you can find hundreds of free video sharing sites that allow users to use their platform to distribute videos. Or web usage of services most popular free video sharing sites list, everyone can share their own videos with the world.
It is more viral than text content as it is shared and distributed more willingly and readily. A good video will promote itself but you can always help it by distributing throughout popular video sharing sites. It is a double benefit if those video sharing sites allow direct "do follow links" from the video page or user profile page.