StumbleUpon, the platform that allows users to discover and recommend videos to others has expanded sources of videos curated into the system.  The San Francisco-start-up initially allowed users to "stumble" and collect clips from YouTube.  It expanded in recent months to include Google, MySpace and Metacafe.

Today, it added College Humor, Funny or Die, Vimeo, DailyMotion, and 

Last September, I interviewed StumbleUpon founder Garrett Camp.  I’ve reposted the video here.  He explains the monetization scheme for the eBay unit.  Check out the take on StumbleUpon by Liz Gannes over at NewTeeVee.

— Andy Plesser