16. The method of claim 15 , wherein comparing the set of keywords to the keywords from the user profiles of the group of users of the social networking system who previously responded to the invitation comprises: determining a first occurrence, in a first group of user profiles corresponding to a group of other users who responded positively to the invitation, of keywords from the set of keywords; determining a second occurrence, in a second group of user profiles corresponding to a group of other users who responded negatively to the invitation, of keywords from the set of the keywords; and computing a score for each of the keywords from the set of keywords based on a comparison of the first occurrence of the keywords and the second occurrence of the keywords.
16. The method of claim 15 , wherein comparing the set of keywords to the keywords from the user profiles of the group of users of the social networking system who previously responded to the invitation comprises: determining a first occurrence, in a first group of user profiles corresponding to a group of other users who responded positively to the invitation, of keywords from the set of keywords; determining a second occurrence, in a second group of user profiles corresponding to a group of other users who responded negatively to the invitation, of keywords from the set of the keywords; and computing a score for each of the keywords from the set of keywords based on a comparison of the first occurrence of the keywords and the second occurrence of the keywords. 18. The method of claim 16 , wherein the computed score for each of the keywords is based on a function of the first occurrence of the keywords and the second occurrence of the keywords, wherein the function is selected from a group consisting of: an arithmetic difference, a ratio difference, an information gain, an odds ratio, and a relevancy score.