Got a little question

I have a question that you guys may know how to answer. I took a bunch of pics of mine and my buddies car yesterday and i messed with the exposer and shadow and contrast etc. in iphoto so it completely changed the photo. I want to upload them into my facebook but when the upload forms pop up all the pics are normal, the editing i did isnt on them. Does anyone know how i could get the pics on my facebook with the editing still on them. Gracias hombres.