Realtime social proof: The Humble Bundle (@humble) used a real time bundle sales counter where you could tell that the product sales like hot cakes (along with a time indication to let you know how long you had left to profit).

Realtime social proof: The Humble Bundle (@humble) used a real time bundle sales counter where you could tell that the product sales like hot cakes (along with a time indication to let you know how long you had left to profit).