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sea-maid submitted, created time 2 months 1 week (www.sciencebase.com)
Studies have shown that social networking is a risk factor for catching a sexually transmitted disease (but only real-world social networking; LinkedIn is okay). However, this seems to be more of a result of an understanding of what a social network is than any Internet-induced change in the way people choose sexual partners. Sexually transmitted diseases are by definition (usually) transmitted along intimate social networks. 
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