Does watching online vid takes up data on iphone 4?

Ok i want to watch this anime in bleachget.com using my iphone 4 (i have Wi-Fi on) and i watched 1 episode and i think it takes up a little bit of data or i'm just imagining it. Does it take data if you have Wi-Fi on? If it does how do you get back the lost data

In order to not use your data, you have to make sure Wi-Fi is on and you're connected to a wireless network. Next to your carrier name, what does it say? If it says 3G, you'll be using data. If you see the Wi-Fi icon with the 3 small radio waves, you won't be using any data.

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