From Paterva Wiki
This transform will query the Rapleaf database of social network membership using the Rapleaf API. If the email address is not in the database Rapleaf will return no results and schedule a process to resolve social network membership. This however can take some time. If you are not getting any results from the transform it's best to wait some time and retry. It can take anything from one hour to a couple of days (!!). Unfortunately Rapleaf does not provide a callback function to inform the transform when it has started or finished its processing of the entity. Also know that some social networks will resolve faster than others. That means - you might get results for social network A in an hour and only get results from social network B in a day.