Dropbox has 500 million registered users

"With 500 million signups under our belt, it’s exciting to see Dropbox connecting people around the world with everything that’s important to them. But this milestone hints at something much bigger—how much our users are working together.
Since we started, Dropbox users have created 3.3 billion connections by sharing with each other. That’s a 51% jump in just the last year. And as new people join, they’re bringing friends, family, and co-workers along. 44% of new accounts were opened when existing users introduced people to Dropbox. That’s making for an even more creative and collaborative community.
What they’re achieving never ceases to amaze us. Over 65% of the filmmakers at this year’s Sundance Film Festival told us that Dropbox is integral to their work. Mining industry manufacturer GIW Industries is using Dropbox to speed turnaround time for customers. And News Corp’s 25,000-plus employees have made Dropbox part of their increasingly cloud-centric workflows.
Even though Dropbox is based in the US, our last 100 million users have come from all over the globe. Brazilians, Indians, Brits, and Germans join Americans at the top of the list of new signups. The businesses on Dropbox, too, are making it a truly global community. Swedish distiller The Absolut Company and Japanese advertising/PR agency Dentsu are just two of the companies using Dropbox to bridge gaps with colleagues around the world."

Source:  Dropbox, 7th March 2016