The real job of social proof is not "show happy customers." Its job is to lower the perceived risk for a visitor who has never met you, never used your product, and has been burned before by pages that overpromised. A glowing quote is one way to do that. It is not the only way, and for an early product it is rarely the best way you have on hand.
Here is the trap almost every founder falls into: they leave the entire trust section blank, waiting for the perfect named, photographed, outcome-rich testimonial to arrive. Meanwhile the page ships with a hole where credibility should be — and an empty trust section reads as "nobody has vouched for this yet." Partial proof and adjacent proof both beat a blank space. Every time.
Think of social proof as a spectrum, not a single asset. Direct proof (customer quotes) is one band. You also have founder proof (who you are and why you're qualified), process proof (how the thing actually works), data proof (numbers you can stand behind), and borrowed proof (real integrations, real launches, attributed research). Most founders are sitting on four of those five and only counting the one they don't have yet.
One non-negotiable before you steal anything below: zero fabricated numbers, zero fake logos, zero invented reviews. Fake social proof is the single fastest way to destroy the exact trust you are trying to build — and it carries real FTC and legal exposure. The formats here are grouped so you can match them to the inventory you actually have: literally zero customers, a handful of beta users, or proof that needs no customers at all.
If you want the underlying definition first, read what social proof actually is — then come back and steal the formats.