If the web is a "Social" something then this equals Facebook, Xing, Twitter, LinkedIn Google+. But social could mean.... "see what your friends are searching, buying, watching, liking, saying or doing" "buy together and recommend "filtered by who you know" "what's trending" "where are my friends right now or where will they be" Given that a social graph is a digital map that says, "This is who I know." It may reflect people who the user knows in various ways: as family members, work colleagues, peers met at a conference, high school classmates, fellow cycling club members, friend of a friend, etc. Social graphs are mostly created on social networking sites like Facebook and LinkedIn, where users send reciprocal invites to those they know, in order to map out and maintain their social ties. And an interest graph is a digital map that says, "This is what I like." As Twitter's CEO has remarked, if you se...