Google's Campfire One: Introducing OpenSocial

An excellent video from Google's first CampFire One event showing the wide adoption of OpenSocial initiative by most of the important social networking sites such as MySpace, Friendster, hi5, LinkedIn, Ning, orkut, Salesforce.com, Tianji, Viadeo, and XING.
On the official Google blog, Joe Kraus, Director of Product Management at Google, introduced OpenSocial as:

a set of common APIs that make it easy to create and host social applications on the web. OpenSocial allows developers to write an application once that will run anywhere that supports the OpenSocial APIs.