I`m not sure why the hooplove site isn`t coming up for some people. I wasn`t a member when I discovered it. I tried logging out to bring up a non member link but it recognized my yahoo info and automatically logged me back in.
I would suggest doing a Google search "hoop love" and there will probably be a link to it.
I just Googled it and got this link:
http://www.flickr.com/groups/hooplove/
It takes you to the main page (rules and such) and you can then click "join this group".