Web surveillance through social media sites, such as Facebook and Twitter, could be a useful tool for law enforcement to track down crime. In some scenarios, social networks can help local police departments searching for ways to pre-empt the next mass shooting or other headline-grabbing event. According to an online report, "technology companies are pushing products at law enforcement conferences, in trade publications and through white papers that promise to help police filter the deluge for terrorists, traffickers, pedophiles and rioters."

Is it right or wrong for local police departments to conduct Web surveillance via social media sites like Facebook and Twitter?

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