Stardoll, an avatar-based fashion site aimed at young women and girls, says it has reached 50 million unique user registrations.

The site, which launched in its current form in 2006 after growing from an original GeoCities fan page about paper dolls, is now offered in 17 languages and 230 territories around the world. In celebration of its registration milestone, it is offering a variety of free and paid themed in-game items.

Stockholm, Sweden-based Stardoll AB is privately held, with investment from venture capital firms including Sequoia Capital and Index Ventures. The company says the site now reaches 12.5 million unique visitors per month, with around 45,000 new registrations per day.

"It's exciting to see that Stardoll continues rapid growth through keeping a tight focus on our demographic of young women," said CEO Mattias Miksche. "With the virtual goods industry expected to reach $1.6 billion in 2010 and social gaming contributing $835 million of that total, we believe this is just the start for us and that the business is poised for tremendous growth."