Facebook roundup: stock back up after dipping below $18, China on hold, Twitter beats Facebook mobile revenues, and more

Stock rebounds slightly – Facebook shares closed at $18.98 today, up after an all-time low earlier this week when the stock traded at $17.59 mid-day Tuesday. The company this week decided not to make a secondary offering, which would have put more shares on the market and likely hurt the price even further. CEO Mark Zuckerberg indicated that he would not sell any of his shares for at least a year, and board members Marc Andreessen and Donald Graham say they will only sell what they need to in order to cover taxes, which some on Wall Street took as a sign of confidence. Facebook also officially closed its deal to acquire Instagram this week.