"Banning laptops is not the answer here. If one student is a problem, address that student directly and respectfully resolve the issue. Don't make capricious rules against everyone because of a few students who are an issue."
How about I quote my above statement for you:
"Banning laptops in the classroom is absurd. It's hitting a nail with an anvil. Establishing proper etiquette protocol and disciplinary procedures for students who disrupt a classroom is a much more sensible solution to outright bans. Computers are increasingly becoming an integral part of our lives, and students need to learn to be able to use them in a professional manner. Just as you don't see people staring at porn in the classroom or in a business meeting (typically), we shouldn't see people staring at their friend's FB page."
Classroom disruption procedures are already in place in almost every student handbook (every one I've looked at both on the student and the instructor side). This is simply accepting that laptops, cell phones, and other media/internet devices can and do disrupt the classroom. They need to be treated like Walkmans, drum sticks, and naked people.
If someone is quickly checking a fact online or is typing an a word processor, it's no more a distraction than a pen and paper being held upright. If someone is playing a flashy game or flipping screens regularly, its no different than excessively tapping a pencil on a desk or jumping up and down saying, "the power of Christ compels you!"
Use the procedures in place to address the issue, and if necessary, simply add the couple words in the handbook to ensure the idiots out there can't run around the rules claiming it isn't explicitly spelled out that their distraction of choice isn't covered.