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The OS 2.0 update brought support for Android apps on the BlackBerry PlayBook. While many Android apps are available in BB App World, there are still many missing that can be side-loaded onto the device. This is similar to how apps are loaded on the Kindle Fire and B&N Nook Tablet.
Check out my ZDNet Mobile Gadgeteer blog post for more thoughts and experiences on using these Android apps.
There is no official Twitter application for the PlayBook, but the Android one works fine.