Social media needs a definition, then. What separates social media from plain 'ol media? Well, the social. Profiles, contact lists, networks of contacts, sub

Social media needs a definition, then. What separates social media from plain 'ol media? Well, the social. Profiles, contact lists, networks of contacts, subscription to contacts. Following from that, an individualized feed, where each user sees different content based on who their contacts are. Hacker News has almost none of that. There are user profiles, and discussion threads.