• Facebook's interest graph: People have usually described Facebook's data trove as consisting of a "social graph," a portrait of each person's relationships. But since so much content is shared on Facebook — two posts daily per user, on average — it is more useful to think of Facebook as an interest graph, a window into what people care about. Facebook's "like" button is pressed 2.7 billion times every day across the web.
  • The Google+ knowledge/relevance graph: Google+ is best thought of as a complement to Google search, and as a window into what people know or want to know. Google+ will help Google contextualize its trove of search data, offering hints into why people might be searching for certain kinds of information. The relationship goes in the other direction, too — the number of "+1s" and other Google+ data are now a top factor in determining how a Web page ranks in Google search results.
  • YouTube's entertainment graph: What do people like to watch and listen to? What music, artists, videos, TV shows, movies, etc., are they interested in? YouTube is assembling a huge data compendium on individuals' media tastes. YouTube users spent an average six hours watching video on the platform in December 2013 (Facebook users watched less than an hour of video on its platform).
  • LinkedIn's professional graph: LinkedIn harvests uniquely valuable data about individuals' work history and professional networks. Twenty-two percent of LinkedIn users have between 500-999 first-degree connections on the social network, and 19% have between 301-499.
  • Yelp and Foursquare's location graph: All things local filter through Yelp and Foursquare, as people use the two apps to connect with local services and products. Foursquare's 45 million users account for more than 5 billion location check-ins (approximately 110 check-ins per user).
  • Twitter's news graph: At its peak on Aug. 3, 2013, Twitter was processing 143,199 tweets per second globally. That translates to an amazing 8.6 million tweets per minute. The entire population of New York City would need to tweet once every minute to match that volume. These tweets provide a real-time window into the news and information that people care about. Fifty-two percent of Twitter users in the U.S. consume news on [...]