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There may not be a Twitter app, but the Facebook app is preinstalled during the update to 2.0. It is a good app that makes following Facebook friends as easy as can be.
PlayBook 2.0 brings the long-awaited ability to run Android apps, and this app is a good demonstration of how good those can be. The Android player/ emulator is integrated directly into the OS, so Android apps look and behave just like the native apps. In fact, Android apps are not designated as such in the App World, so it is not easy to figure out which apps are native, which are Adobe Air apps, and which are Android.
This app is free and worth every penny.
Android fans will recognize the Dolphin Browser HD right away. It handles tabbed browsing, gesture interaction, and sliding bookmarks as it does on the Android platform. It appears to be an older version than that currently available on the Android platform, but is a solid performer.