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When Facebook and Twitter follow you(r readers) without a click

Wall Street Journal :: Internet users tap Facebook Inc.'s "Like" and Twitter Inc.'s "Tweet" buttons to share content with friends. But these tools also let their makers collect data about the websites people are visiting. These so-called social widgets, which appear atop stories on news sites or alongside products on retail sites, notify Facebook and Twitter that a person visited those sites even when users don't click on the buttons, according to a study done for The Wall Street Journal.

Published May 18, 2011

Continue to read Amir Efrati | Geoffrey A. Fowler, online.wsj.com

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