This is the true story of how Mark Zuckerberg founded Facebook, and it wasn't to find girls

In the Hollywood-stylized version, a Harvard student needed a tool to date girls.

The real version couldn't be further from the truth, Mark Zuckerberg told Mathias Döpfner in an interview with "Die Welt am Sonntag."

At the time, he already had a girlfriend - his now-wife Priscilla Chan - and he was obsessed with the internet. Google was great for searching for news and Wikipedia was great for searching for reference material, but there was a gap.

"There was no tool where you could go and learn about other people. I didn't know how to build that so instead I started building little tools," Zuckerberg told Döpfner.

He built a small tool called Coursematch where people could list what classes they were taking. He did build the Facematch tool, as seen in "The Social Network", but that was just a prank, he says.

Instead, the roots of Facebook go back to a college kid spending too much time programming and not enough time paying attention in class. Here's how Zuckerberg turned a study tool into a social network, and why no one else did it.

That was only the beginning of Facebook. Now the 12-year-old social network has grown into a company investing in the future, from artificial intelligence to virtual reality. Read the full interview on where Facebook is going next here.