We grabbed two NFC smartphones (a Nexus S and a Galaxy S II) and tested the system out. It works essentially as advertised — after opening the app, you put both phones back-to-back and a vibration confirms that the data's been sent. One of the phones is then forwarded to your friend's page in the Facebook mobile app with the "Add Friend" button on it. Unfortunately, the system did not work when we tried using two Android 4.0 phones — Android Beam superseded the app, and even when we disabled Beam we couldn't make the friend request happen. One other thing to keep in mind is that the app will leave updates in your feed unless you tell it not to. Add Friend is available now as a free download in the Android Market.