Tripl is a new online presence fresh out of Sweden, launching soon but currently only in private beta. This will be a social travel application connecting people on their travels, in an effort to “make the world a smaller place”.
Their interesting, intriguing design entices users to sign up for the public beta, so that they can see what Tripl is all about. Also, after entering your email address, Tripl encourages each user to refer the site to 1 other person before they are granted access to the public beta. One referral is not a big ask of most users, so this is a good way of creating a user base before the site has even launched.