you hold your finger on them and then click the cross that will be next to them
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Press the Home button.
Keep pressing it until it starts shaking then a cross should appear in all the apps and if you press the cross it asks you if you want to delete.
Your iPod will not delete apps on its own. You must delete the apps yourself.
Well if u want to delete data from an app, u can for some apps but if u want to just delete the app and download again (ipod/iphone) I'm not sure about face book or myspace sorry
you dont