Not a change in Wikimedia, but a change in society
Facebook makes uploading photos easy by ignoring copyright law. I wonder how long they can get away with that? Wikipedia (and Wikimedia Commons) have complex and difficult procedures for uploading photos because we account for the dreadful complexity of copyright law. See the links under commons:COM:EIC#Copyright for an introduction to the copyright nightmare and how it impacts a free content project like Wikipedia. Facebook simply pretends none of that stuff exists, therefore uploading becomes easy.