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Re:Ask HN: How did Twitter value Periscope at $100M before l... by phsource on Saturday February 06, 2016 @01:19PM (#11048928)
This isn't the first time Twitter has bought a pre-launch company for this much, and the answer is probably the same way that Twitter managed to value Vine at $30 million before its launch: http://allthingsd.com/20121009/twitter-buys-vine-a-video-cli...

For any pre-launch company, this would mean looking at the product, the team involved (as in acquihires), and the fit with the parent company.

Re:Ask HN: How did Twitter value Periscope at $100M before l... by iamshariq on Saturday February 06, 2016 @01:30PM (#11048984)
Looks like Twitter has a good eye and an appetite for risk.
Re:Ask HN: How did Twitter value Periscope at $100M before l... by GFischer on Saturday February 06, 2016 @03:52PM (#11049793)
I agree, both Vine and Periscope seem to be good value.

I wondered if they bought many busts for equivalent valuations, fortunately Wikipedia has a list:

https://en.wikipedia.org/wiki/List_of_mergers_and_acquisitio...

And there's a list of companies I haven't heard of, no idea if they were good buys or not (Gnip, Namo Media and others).