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A programming tutorials website http://www.infotuts.com/ provides downloadable source code at the end of the articles. But before downloading, visitor must share the post on a social networking site like Twitter, Facebook or Google Plus using one the links provided.
The text reads 'Please support us with your love by sharing this tutorial, use one of the buttons below to unlock the content' with three buttons which open to reveal the button to be clicked. Also, the 'Download Code' heading in between two closed locks.
This is the first time I have seen a mandatory share to allow download of content and I don't like it. It feels like a mild extortion.