9. The system of claim 2 , wherein the online module is configured to select the phrase-based classifier based on the text data items being self-descriptive of an attribute of the users of the social networking site.
9. The system of claim 2 , wherein the online module is configured to select the phrase-based classifier based on the text data items being self-descriptive of an attribute of the users of the social networking site. 13. The system of claim 9 , wherein the attribute is a job title.