Macworld.com – Twitter and the iPhone have always seemed made for each otherâquick messages you can tap out on your phoneâs keyboard while youâre on the go. But will the iPad show a similar affinity for the social networking service? If the App Store is any indication, app developers think so: the store is already awash with Twitter clients for the new device. Here are three popular apps for the site that have made the jump from iPhone to iPad.