Ask HN: How many billion dollar YC companies had traction before YC?
https://news.ycombinator.com/item?id=8758129Stripe: Known founders (sold a company for several million) but had few users.
Dropbox: Launched on HN before YC interviews, might have had traction.
Airbnb: Maybe some from before they pivoted?
Twitch: Evolved from Justin.tv, which had some traction, but Justin.tv evolved from Justin casting his life. No traction beforehand?