In the iOS 5.0, 5.0.1, and 5.1 there is an app that cannot be deleted. Iris green. It is called iMessage. You can text other people who have iPods iPhones or iPads.
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There is a app called skype you can text with it and theres ebuddy which id for instant messeging
You need to update to the latest version of iTunes together with updating the operating system for your iPod in order to get the iMessage, which is a free messaging service between apple users. Some iPods cannot be upgraded, check out apple's website to see if your model is compatible for the iMessage service.
You can only get it if you have a 4th generation iPod.
iMessage is on iOS 5 and the iPod touch first and second generations can't support it.
For iMessage on iPod touch you don't get a number people will contact you using the email you used when you signed up.