The second largest search engine on the web. Start building YouTube into your web and social optimisation campaigns by considering the following:

1) Set up and customise your own channel to represent your brand. Try to see what others have done.

2) Set up "comments" like you would post a Facebook update.  The point is to encourage comments. Converse with people, give advice etc.

3) Use video as "Reply to" another video as a commentary or enhancement on another.  Or simply refer to another site or channel as a related topic.

Import YouTube into your Facebook Fan Page using the app "INVOLVR"

See http://www.youtube.com