By Alexei Oreskovic SAN FRANCISCO (Reuters) – Facebook Inc on Wednesday opened up its Messenger service for developers to create apps and for shoppers to communicate directly with retailers, as the Internet company seeks to expand its reach. The new features mark Facebook's latest effort to transform its mobile messaging service into a full-featured platform with the same pull with consumers and businesses as its flagship 1.4-billion user social network. Facebook unveiled the new features at its annual developer conference in San Francisco, for the first time allowing developers to create apps that function inside the Messenger service used by more than 600 million people.
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