I know it\'s possible to get an rss feed or whatever for wall posts of groups. However, every time I try it with a closed group that I belong to, it doesn\'t work. Is this possi
You should switch to v2.3 because from version 2.4 facebook restricted with closed groups and also user's new feed.
Try with v2.3 and check on read_stream on get token access. Note that only by switching to v2.3, we can see the read-stream option
https://tngotran.wordpress.com/2017/02/01/facebook-api-explain-example-and-real-project-tutorial/