I also still can't see them, and I'm pretty sure that I've used https in the IMG tag before. Odd.
Clockwork: there are two main forms of web protocol, http (hyper-text transfer protocol) and https (http secure) - the latter is now at least as normal, especially on larger websites like Facebook as it offers more security in the connection. (There are incidentally other protocols, like
Gopher, but nobody really uses them now).