So, my blog (http://www.roadcrazed.com) is getting a lot of traffic from StumbleUpon. I have a Paid Discovery campaign going, and I'm also getting a lot of organic stumbles. However, it seems like almost all of the traffic is dropping off almost immediately, even though I have my campaign to only attract stumblers from my niche. To try and resolve this problem, I created a graphics-heavy splash page (http://www.roadcrazed.com/splash/) to try and gain some more attention. This splash page has fared slightly better with StumbleUpon, but not much. Any tips or suggestions? Thanks.
Not really. Sites like StumbleUpon are not really known for their quality traffic which is why it usually results in relatively high bounce rates.
If you are able to provide quality and interesting things you can definitely attract users on StumbleUpon.
You must use some social networking tools to add followers or create massive traffic on your stumbleupon account, Like addmefast or youlikehits etc. You just have to add your site on these tools and little bit effort of your can give you result as you wants.