Sophia Amoruso's Online Startup Nasty Gal Earning $100 Million In Annual Revenue: Site Creator Calls Her Business 'Fastest-Growing Retailer In America' [VIDEO]

Sophia Amoruso's online clothing retailer Nasty Gal has grown from a small eBay-based thrift store find business to fashion juggernaut since its creation in 2006.

Nasty Gal made $100 million last year and is predicted to make even more in 2013. Sophia Amoruso's retro fashion business with a tech-savvy business plan has 613,000 Facebook likes and 600,000 Instagram followers.

"People say: 'Nasty Gal? What's that?'" the 28-year-old Amoruso told the New York Times from her new company headquarters in downtown Los Angeles. "I tell them, 'It's the fastest-growing retailer in the country.'"

The newspaper finds that 25 percent of Nasty Gal's 550,000 customers visit the site daily for six minutes, with the top 10 percent returning over 100 times-a-month to Sophia Amoruso's website.

"I would expect them to have a few million visitors a month," said Sucharita Mulpuru, a Forrester analyst, surprised at Nasty Gal's ability to do so much with so little. "It speaks to an engaged audience," she said. "They've figured out the marketing tool. That's the real story."

Amoruso remains cautious in counting on Nasty Gal's growth to continue at the pace it has.

The company, like the album "Nasty Gal" by 1970s acid-funk pioneer, (and Miles Davis ex-wife) Betty Davis that inspired its name, is beloved by fans for being edgy and groundbreaking, a distinction that can get more difficult with quick success.

"Only the paranoid survive," is reportedly the Sophia Amoruso personal motto.

"[Nasty Girl's success has] been very charmed, but I'm not willing to rest on my laurels," Amoruso said. "It's only going to get harder to keep building from here."

See a video montage for the song "Nasty Gal" that inspired the name for Sophia Amoruso's company RIGHT HERE: