Leverage your users existing contacts! Your users can invite their friends by typing in their email address. The email can be entirely customized to fit your community in every way.
Your users might not be into email anymore so let them invite anyone they like by providing them easy to use invite links. Your users can provide these invite links to anyone they like anywhere they like and even use the built in Share feature to share the link in their favorite mobile or desktop application!
Configure every aspect of the process. You can limit users invites on a per-user basis using a field as the invite limit. Adjust who can even send invites with robust access controls. Establish connections between users when accepting invites. You can even have invites expire after a specific timeframe has passed!