You can upload video files to YouTube servers and post on the forum boards of websites like this myce.com explaining about your YouTube video. Or, tell your friends about them via messengers and emails. You can make them less intrusive and less spam-like by adding some helpful remarks and sexy titles. Good luck!
[PS]I post video files (up to 10 seconds in length) through Kakao Talk. It's quite useful to show my Kakao Talk friends how to use some hardware and software or what I am doing at the moment or what the street is like.[/PS]