Internet's biggest sites wiped out Tuesday

All it took to wipe out some of the Internet's biggest sites Tuesday was some faulty PG&E electrical breakers that caused a blackout in downtown San Francisco.
Some of the Web's hottest destinations - Craigslist, Yelp, Second Life - were suddenly inaccessible from San Mateo to Singapore after back-up generators failed at the facility housing their computer equipment.
Although mostly fixed within 12 hours, the incident shows how easy it is to send major swaths of the online world to the dark ages. Sites that millions of people rely on...
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