golden hour

/var/www/html/wp-content/plugins/buddypress/bp-activity/actions

File/Folder	Size	Actions
delete.php	2.16 KB
favorite.php	1.01 KB
feeds.php	6.9 KB
post.php	2.91 KB
reply.php	2.13 KB
spam.php	2.29 KB
unfavorite.php	884 B

Edit: favorite.php

<?php
/**
 * Activity: Favorite action
 *
 * @package BuddyPress
 * @subpackage ActivityActions
 * @since 3.0.0
 */

/**
 * Mark activity as favorite.
 *
 * @since 1.2.0
 *
 * @return bool False on failure.
 */
function bp_activity_action_mark_favorite() {
	if ( !is_user_logged_in() || !bp_is_activity_component() || !bp_is_current_action( 'favorite' ) )
		return false;

// Check the nonce.
	check_admin_referer( 'mark_favorite' );

$activity_item = new BP_Activity_Activity( bp_action_variable( 0 ) );
	if ( ! bp_activity_user_can_read( $activity_item, bp_loggedin_user_id() ) ) {
		return false;
	}

if ( bp_activity_add_user_favorite( bp_action_variable( 0 ) ) )
		bp_core_add_message( __( 'Activity marked as favorite.', 'buddypress' ) );
	else
		bp_core_add_message( __( 'There was an error marking that activity as a favorite. Please try again.', 'buddypress' ), 'error' );

bp_core_redirect( wp_get_referer() . '#activity-' . bp_action_variable( 0 ) );
}
add_action( 'bp_actions', 'bp_activity_action_mark_favorite' );