I have just a few quick questions regarding shooting in RAW. I have recently started doing so and I'm a little all over the place with it. When I choose the RAW format on my camera it'll upload the images in .NEF I will take that and open it up in photoshop, do my thing, and then save as in .JPG (for my facebook page). Should I be saving as .RAW as well or just leave it in this .NEF type? I don't even know what it is. Also, is there any way to get the RAW or NEF file types to show a preview instead of a thumbnail that simple states the file type?