StumbleUpon is the best way to boost your traffic. Just it needs to discover your page , and to take some stumbles (thumbs up). Remember that discovering a spam webpages leads to ban. So if you want to boost your traffic you must do follow things :
1. Make friends in StumbleUpon.
It`s better to have more friends, because when you discover a page, your friends are noticed and they may come to the page and stumble it. More friends = more possible votes = more traffic, that you will receive. My StumbleUpon account is BorosBG , feel free to add me as friend, and i will add you too. Also post your StumbleUpon account in comments, to may other people add you as friend.
2. Make Stumble Exchanges.
Although this violate TOS of StumbleUpon, many people makes stumble exchanges. Stumble exchange is when you stumble some link, and in return you get stumble for your link. Every thumbs up is a link to your page. This means that more stumbles you get = more links to your page, and better place in search engines.
Here is some places where you may make stumble exchanges :
StumbleUdon
Digble


