“I've seen people build apps in the completely opposite direction where they do the marketing first just for a waitlist... and they just get people to sign up. That's instant product validation.”

Build a Viral Feature Hook Before Building the Full App — TikTok as Product Validation

Founders in Joseph's community have launched TikTok accounts showing Figma mockups of apps that don't exist yet. Breezy, a social note-sharing app, got 5,000 waitlist signups from a 15-second video of the founder describing the concept. The insight: if you can't create a compelling TikTok about a feature idea, that's a signal the feature may not be compelling enough to build. TikTok becomes a free, zero-code product validation layer before a single line is written.