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Re:Ask HN: What are some successful startups built on top of... by bdunn on Tuesday April 15, 2014 @04:21PM (#7594042)
Baremetrics (https://www.baremetrics.io) by Josh Pigford is built off of Stripe. There are also a handful of dunning-related services that sit on top of Stripe, also.
Re:Ask HN: What are some successful startups built on top of... by mercwear on Tuesday April 15, 2014 @02:53PM (#7593635)
Gnip (http://gnip.com/) was just bought by Twitter. I would argue that they built their whole business on top of twitter & other social media companies.
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.
Re:Ask HN: What are some successful startups built on top of... by ig1 on Wednesday April 16, 2014 @11:13AM (#7598261)
Lots in the social media space (ad tools, social analytics, crm, big data tools) also in the enterprise space (i.e add-ons for Salesforce, SAP, etc.)
Re:Ask HN: What are some successful startups built on top of... by x-separator on Tuesday April 15, 2014 @03:13PM (#7593739)
Youtube was originally a Myspace widget.
Re:Ask HN: What are some successful startups built on top of... by aesopwolf on Tuesday April 15, 2014 @03:17PM (#7593758)
Really? Do you have a source?
Re:Ask HN: What are some successful startups built on top of... by mailarchis on Tuesday April 15, 2014 @04:18PM (#7594023)
Search for jawed karims talk at CMU I guess. One of the key reasons of YouTube fast growth was the HTML snippet that you could embed in you MySpace page.
Re:Ask HN: What are some successful startups built on top of... by anthony_franco on Tuesday April 15, 2014 @05:46PM (#7594517)
I remember MySpace ended up blocking YouTube from their site. And YouTube, a small startup at the time, turned to their users to plead to MySpace to activate them again. A few weeks later, they were back in business. But it's interesting to know how close YouTube was to hitting the deadpool.

Edit: Dug up an older article about it: http://www.blogherald.com/2005/12/22/myspace-users-angry-ove...

Re:Ask HN: What are some successful startups built on top of... by pydanny on Tuesday April 15, 2014 @03:35PM (#7593842)
Never heard this before. Got a source?
Re:Ask HN: What are some successful startups built on top of... by chrmaury on Tuesday April 15, 2014 @04:25PM (#7594066)
Siri was built--and still relies--on Dragon Mobile Speech Recognition from Nuance
Re:Ask HN: What are some successful startups built on top of... by AbhishekBiswal on Wednesday April 16, 2014 @11:07AM (#7598212)
Shit, I didn't know that. Whoa.
Re:Ask HN: What are some successful startups built on top of... by mirador on Tuesday April 15, 2014 @03:06PM (#7593699)
Dropbox and Heroku are built on top of AWS (amongst thousands of other companies)
Re:Ask HN: What are some successful startups built on top of... by jiggy2011 on Tuesday April 15, 2014 @03:12PM (#7593734)
They use aws as infrastructure but aren't inseparably welded to it. They could presumably switch to hosting elsewhere without changing their product itself.
Re:Ask HN: What are some successful startups built on top of... by cnaut on Tuesday April 15, 2014 @06:03PM (#7594605)
You can see them as abstractions of AWS in some ways. An average consumer wouldn't go through the trouble of dealing with AWS to backup their files and even for developers heroku provides a nice level of abstraction
Re:Ask HN: What are some successful startups built on top of... by mirador on Thursday April 17, 2014 @03:29AM (#7602369)
Agreed, that's the way I've seen these companies. AWS has truly become a layer that powers a huge part of the applications on the web.
Re:Ask HN: What are some successful startups built on top of... by eam on Tuesday April 15, 2014 @03:12PM (#7593732)
And also many companies are built on top of Heroku...

TwitPic on top of Twitter.

Re:Ask HN: What are some successful startups built on top of... by alinajaf on Tuesday April 15, 2014 @04:14PM (#7594006)
AppointmentReminder by patio11 relies pretty heavily on Twilio AFAIK.
Re:Ask HN: What are some successful startups built on top of... by dapvincent on Tuesday April 15, 2014 @03:54PM (#7593931)
NextBigSound is built on top of plenty of social media companies.
Re:Ask HN: What are some successful startups built on top of... by nyddle on Monday April 21, 2014 @10:48AM (#7621275)
Heroku on Amazon