Flickr, 500px, and so on are sites that display photos well. Facebook removes EXIF data from your file, I’m not fond of their terms of service, they have had difficulty with privacy issues in the past, and I don’t like the way photos look. Put the same photo on Flickr and Facebook, then look at both, see what you think. There are also social sites dedicated to photography, which are more discussion oriented.
I suppose the question is, are you looking for a gallery to display your work, a venue for advertising, or an on line camera club?
As you have probably seen already, people are posting whatever they have, regardless of quality, so you might as well jump right in.