I'm trying to read some post information about some FB pages/profiles. I'm considering the Graph API version v2.8, and following this documentation. But there are some fileds accessible from the Graph API that are not listed in the above link, for example the fields is_popular, target, promotion_status and timeline_visibility.
So far, the first two parameters didn't give me any result, but I can obtain both the promotion_status and timeline_visibility results from some posts. How can be possible that the set of the available fields in the reference and in the graph API tool are different for the same version of the API? Should I avoid to request these feelds and lean my word on them?