There are referral program softwares already in the market, but none of them focus on Pre-launch waitlist Automation Referrals. Here is a solution.

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Vijay Peduru provides one million-dollar startup idea every Tuesday. 
These ideas won't help you build the next Instagram or Twitter, but would help you
create a $2K to $10K MRR(Monthly recurring revenue) business. The goal is to help you accumulate half a million to a million dollars in 3-5 years.
These ideas could be easily implemented without much tech background.