BuddyPress.org

On this page: http://codex.buddypress.org/buddypress-components-and-features/ it says that blog posts made on child sites ( in a multisite setup ) are available in the activity stream of the partent site.

I’m looking at the Activity page here: /wp-admin/admin.php?s&page=bp-activity&action=-1&activity_type&paged=1&action2=-1 and I don’t see my child site posts.

How can I see them, and how could I render them on the homepage?

I’m comfortable coding something if you could point me to the right functions or query vars.

Thanks!