I was facing many problems with updating the RSS on my Facebook profile.
The RSS entries were not getting refreshed for almost 3 weeks.
I almost tried all the famous RSS apps like Simply RSS and Blog RSS Feed Reader but none of them worked.
Then after doing a little bit of search I found out RSS Connect.
It worked great and all my friends are happy now to see my latest updated content.
Just give it a try, here is the link for RSS Connect