Stumble Upon is a fantastic Search Engine that is really useful for researching purposes.
You may have your blog / website up and running and are considering your next article. I would recommend using Stumble Upon in tandem with your usual search engine as it throws up very different results.
The great thing about Stumble Upon is all the results have been rated by the other Stumblers – There are nearly 10 million users of Stumble Upon.
Another benefit to Stumble Upon is the tool Su.pr. This is a super tool for directing traffic to your site. I have been shocked by level of traffic generated!
With Su.pr, you can add your sites content, article by article, to Stumble Upon. Watch your traffic soar!
If you haven’t used Stumble Upon for research – do so from this point on.
If you haven’t used Su.pr for Traffic Generation – You are seriously missing out!!
seocopywriteruk.wordpress.com 
Hi,
Sorry for late reply.
Su.pr is really good at adding your blog post to Stumble upon.
At the base of Stumble upon page, (I think) in 3rd column, you will see a link to Su.pr, just click on this and follow instructions.
Very easy to use, just paste your blog posts URL where you need to.
Hope this helps you. Happy Promoting!
Paul.
I am using stumble upon, and I like it very much. My blog is at http://www.stevendaughertysblog.wordpress.com, and I have put it there.
Glad you enjoy Stumble Upon Steven, for someone your age you have a blog to be proud of – Keep up the good work! Paul.