How do you manage your closed beta invites?
Do you create an individual invite code for everyone who signs up to try your beta? Or have some codes which can be used multiple times (eg works for 10 signups)?
Are there any sites that manage the whole process of people applying for invites, sending out invites, etc? Inviteshare.com is the nearest thing I could find, but it's geared more towards exchanging invites between users.
A) Create one invite code, send that to a lot of people. B) From the people who sign up, give each new account an invite code itself, so that person can sign up. You can assign a random string or set a class for 2nd degree invites. C) Repeat step B, and adjust invites accordingly to the amount of growth.
A prerequisite for Step B is making sure that you have invitations built into the system, so that people it won't be ignored.