(Reuters) – More than a dozen brokerages increased their price targets on Facebook Inc shares on Thursday. Facebooks shares fell 3 percent to $47.45 at the opening, resuming the roller-coaster ride they have been on since the No. 1 social network released results on Wednesday. Facebooks shares soared as much as 15 percent in extended trading on Wednesday before suddenly falling to $47.40, down 3 percent from their $49.10 close. Facebook shares, which have nearly doubled in value this year, breached the $50 mark in heavy premarket trading after a slew of analysts raised their price targets to as much as $65.