How much traction can you get before you even build the product?

Most founders rush into building, but some do the opposite. They validate demand first, sometimes without writing a single line of code. A few ways I’ve seen it done: 1)Run targeted ads to a simple landing page with email capture 2)Build a niche audience on social media 3)Publish a newsletter around the problem space 4)Use surveys or polls to gauge interest The benefit? You know exactly who’s interested and you’re building a warm audience that’s ready on launch day. What’s the best pre-product traction hack you’ve used or seen?