I would hesitate to join a group that worded their 'requirements' like that. I have several facebook accounts (i run an online business and belong to several non-profit groups) and I am a moderator on a couple online chats. We inform folks that only relevant posting will be allowed, no links and no 'non-stream' discussions. But, that is to keep the content relevant. Anyone can join and post as long as they follow the guidelines. But, to say you need to have your own postings on another site seems a bit odd. Using our guidelines, we have a lot of new folks posting their first creations and asking for help, tips and comments along with seeing some phenomenal works and getting inspired. This is how the craft grows! Your group seems to be a bit exclusive rather than inclusive. My advice is find another because there and hundreds!