Is this the first company to go public that (almost) started/took-off as a "Show HN"? In a way, this is a big moment for YC, PG and this community. Is there a l

Is this the first company to go public that (almost) started/took-off as a "Show HN"? In a way, this is a big moment for YC, PG and this community. Is there a list of "Show HNs" that have become "big"? It would be very interesting to see.