BuddyPress.org

something like:

`
$activity_id = bp_activity_add( array( ‘id’ => 555, ‘action’ => ‘something new and blue’ );
`

no reason to use the do_action – that is just a trigger point for hooking into buddypress.

make sure you capture all the previous activity data and pass that back in – performs a full sql update on all cols (see the code in https://wordpress.org/extend/plugins/buddypress-edit-activity-stream/ )