Yep. The idea of guessType is to be able to guess the "type" property without having to provide it. It is not used in Facebook at all (but might be used later, for performance), but in Twitter, it is used. For example, if you pass a "home timeline" filter, and not passing the type, the overloaded method in Twitter will be able to guess that you want to retrieve an user (because only users have connections to home timeline).