By Nick Bilton May 27, 2012 1:53 pm May 27, 2012 1:53 pm Bay Ismoyo/Agence France-Presse — Getty Images Facebook could build its own smartphone by next year, according to people close to the company. Can a software company build its own smartphone? We may find out soon. This past week, Google completed its acquisition of the hardware maker Motorola Mobility for $12.5 billion, which could lead to t