[Tosh]

This will post new topics/replies from your Simple:Press Forum into the BuddyPress Activity stream and you can even filter it by “Show New Forum Topics” or “Show Forum Replies”. The view button will take you right to the permalink as well!

Here is the code for it. Under [Update x2]

http://blog.slyspyder.com/2010/08/15/integrate-simplepress-forum-into-the-buddypress-activity-stream/