How much data does iMessage use w/I Wi-Fi?

I share a plan w/ 3 people and towards the end few days of the month we will usually receive a message saying 65% of data has been used.

I just recently switched to iPhone. I RARELY ever have Wi-Fi so it's just safe to say I never use iMessage without using data. And any time I'm using any social networking app I never have Wi-Fi either (the apps have never been a problem for over usage before though so I'm not worried)

I use iMessage quite a lot. I text my boyfriend's iPod with it and we use it all hours of the day pretty much (except for sleep duh)

I have 10, 000 MB of shared data (not sure how many GB this is)

How much data is iMessage really using? Am I at any risk for going over my plan?

(The other 2 people on my plan do not use iMessage and do not use Internet nearly as much as I)

Approx. 0.5mb per message sent

So little it doesn't matter

Imessage is soley through Wi-Fi.

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