The company was founded by a group of friends in Canada and proved to be an instant hit which led to investment and a move to San Francisco. As StumbleUpon continued to grow, pulling in millions of users, it attracted the interest of eBay and they acquired the company in 2007 for a massive $75 million. The service is very easy to use and with so many people engaged in voting on content it provides a useful guide to websites that are worth checking out in specific categories. The service links to websites and individual pieces of content such as articles and videos, the more popular something is the more often it will be returned to users looking for content in that category and so it is capable of sending high volume targeted traffic to websites.