Taking a Break by interHaptic LLC
Taking a Break is an iPhone app that allows you to easily schedule breaks from Facebook and Twitter, and it auto replies to all your incoming communications while you are on break. Taking a Break auto replies to Facebook Comments, Wall Updates, Messages, and Event Invitations, and to Twitter @Mentions (with Messages) and Messages.
Taking a Break is the first app to help people who are addicted to social networking, and it introduces a new social networking etiquette by allowing users’ Facebook and Twitter accounts to politely send auto replies while they are unavailable or away, instead of ignoring their friends and followers.
Taking a Break also helps users stay away from Facebook and Twitter while they are on break, if they need help staying away.
Developer Website: http://www.takingabreakapp.com