I tryed to download facebook app to my itouch 4g but says need iphone 3.0 how can i get it

i tryed to download facebook app to my itouch 4g but says need iphone 3.0 how can i get it

Which ipod generation do you have?
For original: 
Purchasing iOS 3.1 Software Update for iPod touch (1st generation)
Otherwise, click check for updates.

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