Custom Social Count Plus Number Format

functions.php

<?php

/**
 * Custom Social Count Plus Number Format.
 *
 * @param  int   $number Default number.
 *
 * @return float         New formated number.
 */
function custom_social_count_plus_number_format( $number ) {
    return number_format( $number, 0, '', ',' );
}

add_filter( 'social_count_plus_number_format', 'custom_social_count_plus_number_format' );