Smartphone app shares location for set period of time.
At-home tech analyzes your sleep patterns.
Online platform highlights the most-talked-about web content.
Real-time maps reveal patterns for traffic, weather, and more.
Virtual marketplace sells stylist- and Kardashian-recommended merch.
Rovio Mobile, $42M
Budding mobile-games empire includes Angry Birds.
Free web directory helps customers book doctors.
Gilt Groupe, $138M
Flash sales for fashionistas and more.
Coda Automotive, $147M
Flagship car gets 150 miles per charge.
Tiny dongle turns smartphones into credit-card readers.
Cloud storage service lets users access files from anywhere.
Groupon's close competitor now touts 46 million members.
Brightsource Energy, $459M
New solar plant will power 140,000 homes.
Social-gaming empire includes CityVille and FarmVille.
Microblogging platform generates 200 million tweets per day.
Daily-deals pioneer filed for IPO in June.
The social-networking powerhouse now serves more than 800 million users.
[Infographic by Peter Oumanski]
A version of this article appeared in the December 2011/January 2012 issue of Fast Company magazine.