When I see a large spike in traffic on several of my blogs, I don’t even have to check the logs to know that there’s a good chance it’s folks coming via StumbleUpon (SU).
SU discovers Web sites based on your interests and keeps track of the pages you like in order to deliver similar content. [...]

Despite having not too much noise during the time that it has been operating, StumbleUpon managed to survive the test of times and was able to gain followers and users. In fact, the StumbleUpon site its number of stumblers to around 6,089,710 already. Despite this numbers though, StumbleUpon still has not managed to emerge as [...]

StumbleUpon now have introduced to public new service StumbleVideo which can ease you to search videos you want. As the Internet video now is on the wave I think StumbleUpon want to take their part of the pie.