Stocks with call strike movement; BBRY TWTR BlackBerry (BBRY) January 11 call option implied volatility increased 2% to 53, Twitter (TWTR) December 46 call option implied volatility decreased 3% to 51 according to IVolatility.
Twitter says user base to shift towards Android, managing products accordingly Says currently, user base equally split between iPhone and Android. Expects Android to become dominant amid global expansion.
Twitter says plans to accelerate pace and breadth of product change Says adding significant functionality to private messaging and will roll out this quarter. Says goal is to build world's largest daily audience. Comments from analyst day presentation.