Barnes & Noble has introduced Nook for Android. This comes in the form of a free app that lets users read eBooks with customizable font styles. The company says this is the first Android eReader app that lets users share eBooks with friends. The company also points out that this is the first eReader software to feature its new "NOOK-centric" branding. The app will soon be followed up with updated apps for the iPhone, iPad, and other devices.