Facebook Opens Up Messenger App to Developers and Businesses

Zuckerberg's Facebook F8 Keynote in Three Minutes

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Facebook Inc. is opening up its Messenger chat application so that other software developers can add new features that will let people include photos, videos and other enhancements to their online conversations.

The app, which has 600 million monthly users, will also be expanded to include businesses seeking to communicate with their customers, who will be able to track packages, make reservations and do other things, Mark Zuckerberg, Facebook’s chief executive officer, said Wednesday at the company’s F8 conference in San Francisco.