To understand social learning, we must first understand social media. Social media is a set of Internet-based technologies designed to be used by three or more people. It's rarer than it sounds. Most interaction supported by technology is narrowcast (one-to-one), often with a telephone call or an email message; niche-cast (one-to-small groups), for instance using email distribution lists or small-circulation newsletters; or broadcast (one-to-many), as in large-scale online magazines or a radio show.