I have been hanging around flickr now for almost 3 days! Unheard of in this era of nano-second attention spans. Admittedly I have been adding tons of my own images, from my own site, but also busy adding tags (to my shots) and making contacts, and commenting on these contacts' work as well.
This site really interests me. It allows the user to upload and store their own photos these can then be organised into galleries, and set for public or private viewing, tags allowing sharing of common galleries. You can also set up galleries of images with images that are cross related, this is a fab idea and allows any user to organise threads and connections within their own bodies of work. So when another user browses a gallery they can then see the other connections made by the original maker of the images.