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It is a wordpress plugin called, OnePress Social Locker.
It allows you to lock a part of content on a web page until a user clicks one of the social buttons (Facebook Like, Tweet Button, Google +1) and help you to get more likes/tweets/+1s, traffic.
I do not why you would think anyone will ban you for using this, plus the plugin is SEO friendly. Locked content is still available for search bots.
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