add_action( 'bp_share_user_services', 'wbcom_add_new_service', 10, 3 );

function wbcom_add_new_service( $services, $activity_link, $activity_title ) {

	$services = array
        (
            'chb_bp_share_whatsapp' => 1,
            'service_name' => 'Whatsapp',
            'service_icon' => 'fa fa-whatsapp',
            'service_description' => 'Facebook is an American for-profit corporation and online social media and social networking service based in Menlo Park, California, United States'
        ) ;
        echo '<a target="blank" href="whatsapp://send?text=' . $activity_title .' '. $activity_link . '" class="whatsapp-button whatsapp-share bp-share" rel="whatsapp"><span class="fa-stack fa-lg"><i class="' . $services[ 'service_icon' ] . '"></i></span></a>';
}