public function twitter($what, $text=null, $class=null) {
		if (is_null($text)) {
			$text = $what;
		}

		$attributes = $this->getHtmlAttributes(array('class'=>$class));

		if (substr($what,0,1)=='@') {
			$link = "https://www.twitter.com/" . ltrim($what, '@');
		} elseif (substr($what,0,1)=='#') {
			$parts = explode(' ', $what);
			if (count($parts)>1) {
				$link = "https://twitter.com/search?q=" . urlencode($what);
			} else {
				$link = "https://www.twitter.com/hashtag/" . ltrim($what, '#');
			}
		}

		return "<a href='$link'$attributes>$text</a>";
	}