Instant+messaging


 * **Application** || **Exemplar** || **Tutorial** ||
 * [[image:http://t0.gstatic.com/images?q=tbn:z4vosMNPNlbTIM:http://www.editorsweblog.org/twitter-bird.jpg width="121" height="121" link="http://www.twitter.com/"]] ||  || [|How to tweet?] ||
 * [[image:http://extranet.dulwich-shanghai.cn/images/twit3.gif]] ||  || TwitTester ||