If you see a site you like, click the "thumbs up" on the toolbar. Your profile will show up on that page's stumble profile (usually stumbleupon.com/url/URL TO SITE)
If you want to leave a comment, click the white speech cloud next to the thumbs.
To find someone go to username.stumbleupon.com (I.E. bnx.stumbleupon.com)
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