"We're not building a phone and we're not building an operating system," CEO Mark Zuckerberg said. "We're building something a whole lot deeper than an ordinary app."

Today, phones are designed around people, not apps, Zuckerberg said. "We want to flip that around."Facebook Introduces "Home" Apps For Android Phones [newsroom.fb.com]

Home isn't a phone or operating system, and it's also more than just an app. Home is a completely new experience that lets you see the world through people, not apps.

From the moment you wake up your phone you become immersed in cover feed. Cover feed replaces the lock screen and home screen. It's a window into what's happening with your friends - friends finishing a bike race, your family sharing a meal or an article about your favorite sports team. These are the beautiful, immersive experiences that you get through Home.

Home will be available as a free download from the Google Play Store starting April 12. Home works on the HTC One X, HTC One X+, Samsung GALAXY S III and Samsung GALAXY Note II. Home will also work on the forthcoming HTC One and Samsung GALAXY S4, and on more devices in the coming months.

Home will also be available pre-installed on phones through the Facebook Home Program [link]. HTC and AT&T are the first companies working together to deliver a phone with Home. It's called the HTC First and it goes on sale April 12.