StumbleUpon is testing a new feature called the “Explore Box”. “For any interest, type a word into the Explore Box, and we’ll pull out great stumbles for you that match that interest,” the company explained in an email. It could …

Stumbleupon is one of may favorite social media sites, Not only can it drive traffic that matches or often exceeds that of Digg, stumbleupon users are much less critical/confrontation/judgmental than the typical Digg user.