Duplicate posts in Buddypress Activity

I am getting duplicates in the activity loop of BP -- When a member makes a post from their sub site, we import that post into the main site via post indexer. 2 posts are showing up on their buddypress activity. Do you know of a way to block all posts from site ID #1 from showing up in the BP activity Loop ? Or a different way, only excepting posts from blog id 1?