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At Facebook's core is the social graph; people and the connections they have to everything they care about. Historically, Facebook has managed this graph and has expanded it over time as we launch new products (photos, places, etc.). In 2010, we introduced an early version of Open Graph, an extension of the social graph, via the Open Graph protocol , to include 3rd party web sites and pages that people liked throughout the web.
Open Graph protocol - Facebook Developers
Facebook has created a platform that allows sites and apps to share information about users in order to tailor offers, features and services to each one’s interests and tastes — even if that individual has never visited the site before. When you’re signed on to Facebook, participating websites like CNN.com will display information, goods and services tailored specifically to your interests — without requiring you to sign in at that website or provide it with any information. Speaking at the F8 Developer Conference , Facebook CEO Mark Zuckerberg and former FriendFeed CEO Bret Taylor, who is now Facebook’s director of product, named three new features that will make this possible and easy to implement. Zuckerberg and Taylor described a concept called “Open Graph” that will be useful to businesses and services.
Facebook's Open Graph Personalizes the Web
HOW TO: Add Facebook "Like" Buttons to Your WordPress Blog
This series is supported by Rackspace , the better way to do hosting. Learn more about Rackspace’s hosting solutions here . Facebook officially unveiled its new Open Graph API and tools a few weeks ago, making it possible for developers and end users to easily hook their own sites into Facebook’s broader ecosystem. In just the first week, Facebook’s social plugins were integrated into more than 50,000 websites .Facebook Doesn't Help Me Find Anything
And it's not just Facebook. I've never blocked a Twitter follower. I've never turned down a LinkedIn request. I even joined Plaxo because someone asked me to. I have several distinct social networks full of people that I don't know. And what's worse, I've only recently begun to invite other people to friend me.