You might want to see the first two videos first before watching this but that isn't necessary.

This video describes how to use the FOAF Semantic Web vocabulary and what a Semantic Web Vocabulary is.  This is a continuation of other Semantic Web videos that I've shared as tutorial or how-to videos.  More videos about the semantic web are available here:
http://futurewavedesigns.com/drupal7/training-videos-semantic-web  
Visit this link to get your free profile published and linked with others:
http://futurewavedesigns.com/drupal7/get-free-profile-and-grow-your-network