I've built a new website for amateur and professional photographers - a place to share photos and offer constructive advice to one another. As an invitation-only site (members can invite new members), I expect this site to remain friendly and avoid the pitfalls of an open gallery.
(We do allow "mature content", but it is blocked to non-members; sorry, folks, no free nudes here).
http://www.shutteralley.com
This customized site is still under construction and I plan to add more as we go; but the basics are all there for submitting and commenting on photos as well as inviting your friends to join.
Membership is invitation-only; so if you are interested in participating, please PM (or rep) me your real name and email address and I'll send you an invite code.