I love Flickr, it just does what other sites don’t do, allows me to share my photos in a way that makes sense to me. I think people using it as file space for all their photos rather than carefully curated content contributed to its initial downfall, and I was completely annoyed by Yahoo forcing me to have a Yahoo account. When it was bought by Verizon I pulled all my content and deleted my account. I’ve come back to it since it was purchased by the SmugMug people and am considering paying for a pro account but am managing with a free one at the moment.