Ask HN: Which YC startups have launched before joining YC?

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I know COLOURlovers had been around for a while before joining YC. Airbnb did a re-launch after joining but had been around perviously as well.

As far as I know rapportive also already launched. They did just write a blog post on that: http://martin.kleppmann.com/2010/12/21/having-a-launched-pro...