If your product is useful to someone, it'll probably be useful to some of their friends too. Increase pre-launch signups by requiring users to invite others before gaining access.
Groove was able to get 30% more beta signups each day by implementing a viral signup form that required users to invite three friends in order to get access. As you can imagine, this resulted in a sizeable drop in registrations initially. But some people still signed up, and when their friends did the same, virality kicked in and signups bounced back even higher than before. It's definitely worth A/B testing before you go all-in, though — this blade can cut both ways.
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