Multitasking for iPad is three applications in one available in the AppStore: browser, twitter application, and a Facebook application. One person has complained that the application crashes but I’m sure the developers will work on it, however, Joel Evans of ZDNet is highly recommending the product.
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The browser can work in half or full mode. While in full mode, Twitter and Facebook run in the background, alerting you to updates with sounds. Even when the device is sleeping, the app will alert to new tweets.