static function time_since($since) {
        $chunks = array(
            array(60 * 60 * 24 * 365 , 'year'),
            array(60 * 60 * 24 * 30 , 'month'),
            array(60 * 60 * 24 * 7, 'week'),
            array(60 * 60 * 24 , 'day'),
            array(60 * 60 , 'hour'),
            array(60 , 'minute'),
            array(1 , 'second')
        );

        for ($i = 0, $j = count($chunks); $i < $j; $i++) {
            $seconds = $chunks[$i][0];
            $name = $chunks[$i][1];
            if (($count = floor($since / $seconds)) != 0) {
                break;
            }
        }

        $print = ($count == 1) ? '1 '.$name : "$count {$name}s";
        return $print;
    }


////////////

echo TwitterSearch::time_since(time() - strtotime($tweet->created_at)).' ago';