As you twitt, you quickly learn about bit.ly, tinyurl.com and other URL Shorthening services to make your long URLs suitable to mobile phone. Perfect! Excellent idea! However it only works while service is available. And it may stop being available overnight. Ponder that. Are we coming to "quick in - quick out" internet service?
Learn about tr.im case .... http://blog.tr.im/post/160697842/tr-im-resurrected