BuddyPress.org

hi @tafmakura,

As first, did you activated Activity auto-refresh in BP settings ?
Second, as it concern a custom feature of yours, you have to check for ajax requests on your action post variable.
That said, there is a latency of 15 seconds before “load more” will show up a new activity. Not sure if this can be modified.

Seach on Trac for some hints about Ajax and activity.
Perhaps those tickets #5328, #6195 can help you.