LiveStreet CMS

качаем класс с http://twitter.slawcup.com/twitter.class.phps

и добавляем следующее:

include/function.php

function twitterUrl($url){
     $s = curl_init();
     curl_setopt($s,CURLOPT_URL, 'http://tweetburner.com/links');
     curl_setopt($s,CURLOPT_RETURNTRANSFER,true);
     curl_setopt($s,CURLOPT_POST,true);
     curl_setopt($s,CURLOPT_POSTFIELDS,'link[url]='.urlencode($url));
     curl_setopt($s,CURLOPT_USERAGENT,'Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1');

     $result = curl_exec($s);
     curl_close($s);
     return $result;
}

function twitThis($caption, $text, $url){
     $url = twitterUrl($url);

     $text = strip_tags($text);

     $maxTextLength = 160 - strlen($url) - 4;
     $twText = substr_plain($caption . ': ' . $text, $maxTextLength) . '... ' . $url;
     $TwitterClient = new twitter();
     $TwitterClient->username = CONFIG_TWITTER_USERNAME;
     $TwitterClient->password = CONFIG_TWITTER_PASSWORD;
     $res = $TwitterClient->update($twText);

     if($res===false){
          echo "ERROR<hr/>";
          echo "<pre>";
          print_r($TwitterClient->responseInfo);
          echo "</pre>";
          exit;
      }
}

function substr_plain($str, $length = null) {
    if (mb_strlen($str) <= $length) { return $str;}
    $strPos = mb_strpos($str, ' ', $length);
    if ($strPos > 0) { return mb_substr($str, 0, $strPos); }
    else { return mb_substr($str, 0, $length); }
}

classes/actions/ActionTopic.class.php в нужном месте(например. при публикации топика)

twitThis($oTopic->getTitle(), $oTopic->getTextShort(), DIR_WEB_ROOT.'/blog/'.$oTopic->getId().'.html');