How many tech startups do you know is worth billions of dollars? This infographic by Staff.com lists 12 startups (since 2004) that have reached the billion-dollar worth – Instagram, Evernote, Box, Airbnb, Zynga, Spotify, HomeAway, Square, Groupon, Dropbox, Workday, Twitter and Facebook.

The brief but telling infographic also reveals a few vital statistics of the companies, for instance, have you ever wondered how much capital each of these companies raised in the start to get them where they are today? Guess which of the 13 startups currently employs the most number of employees and which, the least? Even more interesting is how much is Instagram now worth?

Have a look – some of the numbers may surprise you.