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How to get an invitation to invitation only websites
If you know that one your friends is a member, ask him to send you an invitation.
Saying that you are very interested in this particular website can be very convincing.
Post a tweet, a status on facebook or a blog post asking your cyber-friends to help you out finding an invitation.
You can also become a member in technology forums and ask the users for an invitation. ( technology forums are more likely to have members that are already in an invite-only site).