Why not have a yearbook for your online community? Everyone that pays for a copy is included.
Everyone can submit pictures they want in it, and their best memories of being in that community. You could hand out awards too. It worked at high-school.
For that matter, why not start a company that lets people create their own year book? You can pick who you want in it. You could select which Facebook friends they want in it, add a bit of editorial and in-jokes and send to the printers.