24. The method of claim 12 , wherein computing a value for each of the master keywords comprises computing a relevancy score for the first percentage and the second percentage.
12. A method for selecting a subset of keywords from a set of master keywords found in user profiles of social network users, comprising: sending invitations to a first group of users of a social networking system and to a second group of users of a social networking system; observing responses to the invitations from the first and second groups of users; computing the number of occurrences of each of the master keywords in a first group of user profiles, the first group of user profiles associated with the first group of users; computing the number of occurrences of each of the master keywords in a second group of user profiles, the second group of user profiles associated with the second group of users; determining for each keyword of the master keywords a first percentage of the profiles of first group of users including at least one occurrence of the keyword and a second percentage of the profiles of second group of users including at least one occurrence of the keyword; computing, by a computing system, a value for each of the master keywords based on a comparison of the number of occurrences in the first group of user profiles and the number of occurrences in the second group of user profiles, wherein computing the value for each of the master keywords comprises computing a difference between an information gain for the first percentage and an information gain for the second percentage; ranking the master keywords based on the computed value; and selecting a subset of keywords from the master keywords based on the ranking.