[Michael Mc]

//Block certain activity types from being added
function bp_activity_dont_save( $activity_object ) {
    $exclude = array(
        'new_blog_comment',
        'new_blog_post'
    );

    // if the activity type is empty, it stops BuddyPress BP_Activity_Activity::save() function
    if( in_array( $activity_object->type, $exclude ) ) {
        $activity_object->type = false;
    }
}

add_action('bp_activity_before_save', 'bp_activity_dont_save', 10, 1 );

[Author]

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