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The series of web pages which have been positively rated by someone on a social bookmarking website.

On stumbleupon.com, users show that they like or dislike sites recommended to them by the StumbleUpon service by giving a thumb up or thumb down. Hence, "thumbstream".

There is an extremely high percentage of top quality links coming out of Pistos' thumbstream.
by Pistos July 02, 2007
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