I joined the Delivering Happiness online community. Moments later, I received an e-mail welcoming me and asking me to invite more people. They provided easy links.
But why would anyone invite others to a community they've just joined. It might be awful, is that worth risking their credibility for?
Send me an e-mail after I’ve posted my 50th comment asking me to invite friends. Send me an e-mail after I've got 10 friends. Send me an e-mail after I've been in the community for a few months.
When you e-mail your members, distinguish between newcomers, regulars and your top members.