This presentation covers topics related to recent developments in social media, including definitions of key terms, examples of how various platforms work, and statistics about popular social media sites. It discusses the rise of social media platforms like Facebook, wikis like Wikipedia, and virtual worlds like Second Life. In particular, it notes that Facebook has over 70 million active users, Wikipedia has over 12 million pages created through over 200 million edits, and Second Life has been used by companies like Coca-Cola for virtual promotions.