"We have a little bit of information in our API docs that should help you. Go to http://gnip.com/docs and then under the filters heading, click "Entering different types of values within the filter". The confusion may be the difference between entering data via the web form, or just adding the rule values to formatted xml and sending to Gnip via the REST API. If you are still having trouble, I can help you. Just send me an email, ingrid @ gnip.com" - Ingrid Alongi