tokens: For example , if you want ' btaylor ' returned for this user , https://www.facebook.com/btaylor , you 'd grab the ' username ' field from the User Graph Object , as in this example : https://graph.facebook.com/btaylor .
ner_tags: O O O O O O B-Value I-Value B-Value O O O O O O O O O O O O B-Variable O O O O B-Class I-Class I-Class O O O O O O O O