Found this new site StumbleUdon, which lets you exchange stumbles automatically. You may earn up to 15 free stumbles everyday. Without doing anything.
How does it work?
1. Join the program. It will ask for a nickname (your username), password, and your StumbleUpon ID and password. Joining is through invitation.
2. Submit a specific page in your website or blog to StumbleUpon.
3. Then log in to your StumbleUdon account and submit your page. You need credits/udons to submit a campaign. You earn maximum of 5 credits per 24 hours or more if you invite more friends. Remember that you credit score is reset every 24 hours so you have to use it to as soon as you earn it. You get one stumble for every 1 credit/udon.
Get an account now!