I follow these steps:
1- Go to
http://fbrss.com/
2- Click connect with facebook
3- Then click
"allow / ok"
4- Make sure that you
"LIKE" the page you want to get its feed.
5- The page's feed URL will appear in the list below.
6- Get the feed url and submit it as a regular "feed module" in appyet platform, treat it like any other feed module you have on your app.
7- IMPORTANT you need to RE-AUTHORIZE fbrss every 25 days to keep your feed alive.