This may be a dumb question, but is there an "optimal" size when posting images? I tried doing a search and found information on how to post images, but didn't find any information about the size to use. I just recently signed up for a Smugmug account and see they have small, medium, and large links. Is one of those better to use than another? Any advice would be appreciated. What size do you use to upload to a photo hosting site? And then what size (sm, med, lg) link should I use for the Cafe? Thanks!