auto refresh of following activity

Hi, I’m using the last version of wordpess and buddypress. I’d like to use the following activity to chat with my followers in my site. I do the same for the mention activity. I implemented this feature by inserting the following code in bp-custom.php file:

————————–
function do_heartbeat_on_community_mentions( $do ) {
// is it our page?
if ( bp_is_user_activity() && bp_is_current_action( ‘mentions’ ) ) {
$do = true;
}

return $do;
}
add_filter( ‘bp_activity_do_heartbeat’, ‘do_heartbeat_on_community_mentions’ );
—————————–

So I tried to do the same for the following activity:
———————————–
function do_heartbeat_on_community_following( $do ) {
// is it our page?
if ( bp_is_user_activity() && bp_is_current_action( ‘following’ ) ) {
$do = true;
}

return $do;
}
add_filter( ‘bp_activity_do_heartbeat’, ‘do_heartbeat_on_community_following’ );
——————————————
but it does not work ??

Could you please help me?

Thanks in advance!
Giulietta