Many key contributors were invited (because we were in touch off of the platform anyway) and when pepipoo members' user IDs were usurped by someone else, we moved the cybersquatter and gave the user ID to the person we knew to be the rightful owner of the username on pepipoo.
I don't see any need for anything more than that, this site has been up for around nine months and pretty much everyone who was on pepipoo and who wanted an account on here will have made an account by now.