Ask HN: Did any Show HN posts turn into successful startups?

I announced the creation of a class here on HN ( https://news.ycombinator.com/item?id=5862102 -- This was a Show HN, but then it was edited for some reason; link is dead now, but it was a blog post describing the class and had a payment link), which went on to sell out in the first day, then eventually I posted on HN that I wanted to sell it ( https://news.ycombinator.com/item?id=14933206 ), and was acquired because of the post.

Segment.com (formerly Segment.io) - https://news.ycombinator.com/item?id=4912076

Winfify, the company which made the successful A/B testing SaaS product Visual Website Optimizer(VWO) is bootstrapped and successful with $18 millions in revenue.

Their first submission was in 2010: https://news.ycombinator.com/item?id=876141

Always interesting to read comments about the product after 10 years and it`s success :)