4 megapixels is fine for sharing on the internet in reality, 8 would be better of course. I think the problem is how photosharing sites like Photobucket, Flickr, Facebook, etc compress an image when it is uploaded to them to share. Some do funky stuff with sharpening that looks horrible when it is viewed on the internet as a result. I tend to capture the picture at the highest resolution possible, then in the computer change the resolution to 72dpi and then 1000pixels on the wide side of the photo. It has to be done in a photo editing software. In camera often to maximize the viewing on the internet, see if one of them is set to 72dpi which will work well.
