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A comment on Ask HN: What are some successful startups built on top of other services?.

Re:Ask HN: What are some successful startups built on top of... by calcsam on Tuesday April 15, 2014 @02:56PM (#7593646)
Zynga was basically built on top of Facebook. Upworthy was built on link traffic from FB. Then FB changed the way they allowed / promoted sharing and both companies took a hit.
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