The platform offers a set of programming interfaces and tools which enable developers to integrate with the open "social graph" of personal relations and other things like songs, places, and Facebook pages.Applications on facebook.com, external websites, and devices are all allowed to access the graph.
“The search engines really need to evolve a set of answers: 'I have a specific question, answer this question for me.'" On The Graph API is the core of Facebook Platform, enabling developers to read from and write data into Facebook.
The Graph API presents a simple, consistent view of the Facebook social graph, uniformly representing objects in the graph (e.g., people, photos, events, and pages) and the connections between them (e.g., friend relationships, shared content, and photo tags).
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A markup language called Facebook Markup Language was introduced simultaneously; it is used to customize the "look and feel" of applications that developers create.
Using the Platform, Facebook launched several new applications, including Gifts, allowing users to send virtual gifts to each other, Marketplace, allowing users to post free classified ads, Facebook events, giving users a method of informing their friends about upcoming events, Video, letting users share homemade videos with one another, and social network game, where users can use their connections to friends to help them advance in games they are playing.
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“Facebook is pretty well placed to respond to people’s questions. We have a team that is working on it", said Mark Zuckerberg.