From left to right: Pinterest CEO Ben Silbermann, Twitter CEO Dick Costolo, Evernote CEO Phil Libin
WhatsApp: $19 billion
Facebook will buy fast-growing mobile-messaging startup WhatsApp for $19 billion in cash and stock in a landmark deal that places the world's largest social network closer to the heart of mobile communications -- and may bring younger users into the fold. Read more
Tumblr: $1.1 billion
David Karp, the 26-year-old founder of Tumblr, started the service started six years after dropping out of high school. On Mon., May 20, Yahoo announced plans to buy the online blogging forum for $1.1 billion. Read more
Pinterest: $2.5 billion
Not making money hasn't stopped the high-flying pinboard-style photo sharing site from making it into the big leagues.
Evernote: $2 billion
The popular note-taking software maker is now worth more than the New York Times.
Mobile Iron: $1 billion
"Mobile disrupts personal computers, a market worth billions. Cloud disrupts computer servers and data storage, billions of dollars more. Social may be one of those rare things that is totally new." said Robert Tinker, the chief executive of MobileIron, a mobile device management company.
Palantir: $2.5 billion
Big Data is big money and data analysis company, Palantir -- which was founded in 2004 by a team of ex-PayPal employees including Peter Thiel -- is raking it in.
Pure Storage: $1 billion
The data storage firm was the Silver Winner of the Wall Street Journal’s 2012 Technology Innovation Awards.
Spotify: $3 billion
The streaming music service continues its stellar growth after launching in the U.S. in 2011.
SurveyMonkey: $1.35 billion
The cloud-based web survey company has been around since 1999. Last month, the company raised another $794 million.
Bloom Energy: $2.7 billion
Backed by John Doerr, T.J. Rogers and Colin Powell, the Silicon Valley fuel cell maker is on a short list of green technology startups most likely to IPO someday soon.
Gilt Groupe: $1 billion
The online luxury retailer has struggled in recent times, but investors hope a change in management can prepare the once hot company for an IPO.
Reardon Commerce: $1.35 billion
E-commerce is booming and so is e-commerce platform company Reardon.
Square: $3.25 billion
The mobile payments solutions company hit the jackpot when Starbucks announced it would start selling Square’s mobile credit card reader for $10 in all 7,000 of its coffee shops.
Marketo: $1 billion
The marketing automation company is rumored to be looking for a buyer, ideally someone with a billion big ones to spare.
Box: $1.2 billion
The cloud storage provider hopes to go public next year at a value north of $2 billion. Not bad for its 27-year old founder, Aaron Levie.
Airbnb: $2.5 billion
Online room rental service Airbnb has seen incredible growth over the years.
Dropbox: $4 billion
Steve Ballmer called the cloud storage company a "tiny little startup," which probably means Dropbox will soon become the next big thing.
Better Place: $2.25 billion
A recent round of layoffs reveal that the battery-charging service company for electric vehicles is struggling (like EV companies in general).
Twitter: $30 billion
The highest valued company on the list, Twitter followed Facebook's footsteps with a big-time IPO that saw stock prices soar.
Coupons.com: $1 billion
In spite of the rise of deal sites Groupon and Living Social, Coupons.com has been able to carve itself a healthy piece of the coupons pie with clients like Clorox, General Mills, Johnson & Johnson, Kellogg’s, Kimberly-Clark, and Kraft Foods.
Zscaler: $1 billion
With hack attacks on the rise, this in-the-cloud security service for web traffic is raking in cash hand over fist.
Move over Mark Zuckerberg, there are a few new kids on the block. from WhatsApp to Twitter, a growing number of apps and websites are reaching that golden number: the $1 billion valuation.