Can I downgrade my iPod Touch prior to 4.2.1 so Facebook App will work?

Does anyone know if it is possible to downgrade a iPod Touch IOS lower than 4.2.1?
Since upgrading to 4.2.1 Facebook won't operate as FB have updated their iPod App and it doesn't support IOS 4.2.1.

Agreed. It would be trivial for Apple to keep copies of the older version of a piece of software for older devices. They know what version of the OS you use and it would be trivial to only allow you to download the older version. I would imagine there are a few reasons they don't:
Liability.Sometimes, apps update the version because of bugs or security flaws. Keeping an old version which only works on older devices may sound like a good idea, but it's a whole lot simpler not to support it.
MoneyApple doesn't want you to keep your old devices. They earn less money when you're not buying new things. They have little business incentive, other than keeping customers who don't buy as much hardware happier for longer.
Complexity and consistency.It makes the download experience inconsistent. If your friend downloads an app and you download the same app, you expect similar experiences... most people don't think about version numbers. Also, if facebook advertises a feature and you download the shiny new app only to find out that it doesn't work... you'd blame the developer or apple... not your device.
That being said, it would be nice to have the feature to see previous releases in the store. A note like... "This app is not compatible with your device, but an older version is... click here to download that one"

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