Instead, Twitter is focusing development on its TweetDeck web app and Google Chrome apps, and secondarily on its native Mac and PC apps.
Additionally, the company is dropping Facebook integration from all versions of TweetDeck.
TweetDeck is the most powerful Twitter tool for tracking real-time conversations. Its flexibility and customizable layout let you keep up with what’s happening on Twitter, across multiple topics and accounts, in real time. To continue to offer a great product that addresses your unique needs, we’re going to focus our development efforts on our modern, web-based versions of TweetDeck. To that end, we are discontinuing support for our older apps: TweetDeck AIR, TweetDeck for Android and TweetDeck for iPhone. They will be removed from their respective app stores in early May and will stop functioning shortly thereafter. We’ll also discontinue support for our Facebook integration.The company claims the web and Chrome apps will provide "the best TweetDeck experience yet", with those apps receiving new features first. The native Mac and PC apps will receive updates soon after.
TweetDeck for Mac is a free download from the Mac App Store. [Direct Link]