Does imessage on iphone take up data?

I want to get iphone 5 and i want to add some of my friends with ipods on imessage. I know that you need internet for imessage to work so i was wondering if i use it on the data will it take up alot of data or a little?

Messaging takes up so little it wouldn't even matter unless you were attaching 2 meg images to every message. Imessage will also work via cell tower or Wi-Fi.

It won't take up a lot at all don't worry

A little, but it will use.