What began five years ago as an eBay (NASDAQ:EBAY) business founded by Sophia Amoruso has evolved into a powerhouse all its own. Offering a carefully curated combination of unique new and vintage items, Nasty Gal recently redesigned its site and revealed a new in-house label. The site's popularity has been fueled by unpaid forms of advertising, thanks to buzz on social media platforms like Tumblr, Instagram, Facebook, and Twitter. According to PrivCo data, Nasty Gal has increased sales from $6.5 million in 2010 to forecasts of more than $128 million by the end of 2012 . It has raised $49 million in funding from investors like Index Ventures in just five months, and boasts 60% profit margins.