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Browsing Facebook pages or "tweets" that are available to the public is generally acceptable, but breaching personal information without a warrant or shutting down cellphone service in anticipation of a crime encroaches on constitutional rights, says Gene Policinski, executive director of the First Amendment Center at Vanderbilt University in Nashville.
"We open up a dangerous area if we start empowering agencies to prevent us from speaking because it might down the road lead to something else," he says.
The proper response is for police presence in force where these attacks are most likely to happen. When they do, then police exercise their power to be the bigger, better-equipped, better-trained, and Constitutionally-mandated boss of the block until restoration of regular flow.