Digg, once the chief rival to Reddit, has been purchased by ad-tech company BuySellAds. Digg had previously been purchased by NYC-based holding incubator Betaworks for $500,000. BuySellAds says the site will continue to be editorially independent. Digg, a social news site that was once the chief competitor to Reddit, has been bought by digital advertising company BuySellAds for an undisclosed amount, Fast Company reports. "We’re big fans of Digg and we had an opportunity arise that we couldn’t pass up," a BuySellAds representative told Business Insider.