HTC announced two phones with dedicated buttons for Facebook. The touchscreen Salsa and ChaCha (pictured below).
Running Android Gingerbread 2.3.3, HTC modified the Sense UI to integrate the Facebook into the experience. According to the HTC press release,
The Facebook button on HTC ChaCha and HTC Salsa is context-aware, gently pulsing with light whenever there is an opportunity to share content or updates through Facebook. With a single press of the button, you can update your status, upload a photo, share a Website, post what song you are listening to, ‘check in’ to a location and more. For example, you can take a photograph of friends on your phone and upload it instantly to Facebook by simply pressing the button. Or let your friends know what song you’re listening to by pressing the button while listening to music on the phone. The track is automatically identified and shared on Facebook.
Dedicated hardware keys are nothing new (see Yahoo button on Japanese feature phone below) but HTC has taken advantage of the phone sensors and software to give this button multiple uses, as long as your preferred social network is Facebook.
Shipping in Q2 2011 across Europe and Asia and launching exclusively with AT&T “later this year.”