Buddypress Social RSS posting to profile but not activity stream

Hi - as per the instructions I've helped a few members set up their profiles so that they've added a validated/working RSS feed into the profile setting.

This works perfectly when it comes to importing the feed into their profile, but not when it comes to importing their new posts into their activity stream.

A) Is this possible. It certainly seems to suggest it is in the documentation.

B) How do I implement it?

As a bonus RSS feed question, how can I add a feed into a group so that new blog posts are automatically posted to the group?