Mobile application companies have a wide range of options when it comes to generating interest in--and downloads of--their smartphone apps. They can spread the word through Twitter and Facebook, they can generate publicity through press releases and news articles, and they can spend money to advertise their app. But which of these mechanisms is most effective? And how much money should up-and-coming mobile app developers expect to spend on getting users to their apps? Analytics company Fiksu tracks the amount of money its clients spend to acquire new customers and publishes this figure regularly: The average mobile app user costs $1.26 to acquire. But that's not the whole story. How exactly should mobile app developers expect to spend this $1.26 per customer? And what can they learn from the big players in the space about how they purchase new customers? Check out FierceDeveloper's special report on the topic.