Hmmm... why isn't there any major looting during the San Francisco #poweroutage like the looting that occurred in NY in 2003?Oh... right. pic.twitter.com/9Z5owLyInd — Third Position (@Third_Position) April 21, 2017 Power is out in a huge area of San Francisco. If this is the apocalypse it's starting on such a lovely day! pic.twitter.com/TvbWqUe8jt — Olivia Grace (@oliviadgrace) April 21, 2017 A massive blackout likely caused by a fire at a PG&E substation swept through San Francisco on Friday, darkening homes and businesses for hours, shutting down a subway station and all the cable cars, and knocking out streetlights across a wide swath of the city. The power outage, which at its height affected 88,000 customers, struck just after 9 a.m. when a fire erupted at a Pacific Gas and Electric Co.…