This is a great example of using social networking sites for social media/advertising. Companies, organizations, and clubs can build their own network and find interested users internationally.
Advertising with YouTube:
Problem with this? Who do you contact and how do you contact YouTube? I challenge EVERYONE to go to one of these sites and try to find a way to actually sign up to advertise with YouTube. Obviously it is not impossible because companies do it all the time, but it is definately NOT user friendly.
Interesting new topic from Youtube? The "brand channel" a video brand site with customizable aesthetics. So companies can really convey whatever type of user experience they want. This is great for contests, hosting fan site, a base for online commercials, and music/tv show series. A great example of this is Dove's contest for the oscars: www.dovecreamoil.com or the Doritos crash the super bowl.
Free Advertising Link Exchange: