final DataSiftClient datasift = new DataSiftClient(config);
FacebookPage source = new FacebookPage(config);
String fbToken = "long-lived-facebook-api-token";
source.addOAutToken(fbToken, "name", 1381406400);
//username or id is valid
source.addPage("theguardian", "https://www.facebook.com/theguardian", "a name for this");
//or use the ID of the facebook page
//source.addPage("10513336322", "https://www.facebook.com/theguardian", "a name for this");