Cloud storage company Dropbox has reached 100 million users, and to celebrate it's giving away gigabytes.

The company, now five years old, announced the milestone today in a blog entry written by founder Drew Houston.

"Once upon a time, Dropbox had its humble beginnings in a Boston train station when I forgot my USB stick at home," he wrote. "We're still unsure if it was fate or fluke, but one thing's stayed the same all these years: each of us has a unique reason for using Dropbox."

Houston told The New York Times that the number reflects a user base that quadrupled in the last year thanks to more consumers and small businesses using the service.

The company has ushered many new consumers into the world of cloud storage, a space that's quickly getting crowded. But it hasn't always been smooth sailing. Dropbox experienced a glitch earlier this yearthat resulted in users getting spammed via personal e-mail accounts. The company said then that it was taking steps to improve security.

In exchange for Dropbox user stories, like this feel-good one from the coach of a high school football team, the company is giving away 10GB for life for its Top 100 favorite stories and 100GB for life for its Top 10 favorites.