Facebook apps are using social opt-in as a way to access information from individuals as an exchange for using their app. This information, such as email addresses, birthdays, or page likes, is used to market to the individuals. One in four brands have a Facebook app that uses social opt-in. Using the ratio of MAUs (monthly active users of an app)/fan count of the page is a great way for brands to check engagement of their app. Check out this infographic from Neolane to learn more about social opt-in and how brands use it.
Via: Neolane