Discussion about exponential decay functions in popularity metrics. A further development is discussed in the comment, but note that one of the participants feels he can patent exponential decay functions, seemingly based on the innovation of storing the log--good luck with that.

" ... Assuming you can create a business model that satisfies one or more of these needs, how do you know how much to charge? With the development and infrastructure costs of web applications continuing to drop, the price of services has to be increasingly based on value rather than cost ... "