JOURNALIST GLENN GREENWALD SUMMED UP CBS LEAVING TWITTER -- OVER AN ABUNDANCE OF CAUTION -- FOR ALL OF ONE . . . WHOLE . . . DAY:; "CBS NEWS HAS DECIDED IT'S ONCE AGAIN SAFE TO USE TWITTER - BUT ONLY FOR THE MOMENT! IF THERE ARE MORE OUTBREAKS OF FREE SPEECH OR HEARING FROM PEOPLE JOURNALISTS DISLIKE, THEY MAY RETREAT AGAIN."
