This would be Facebook’s third effort at building a smartphone, said one person briefed on the plans and one who was recruited. In 2010, the blog TechCrunch reported that Facebook was working on a smartphone. The project crumbled after the company realized the difficulties involved, according to people who had worked on it. The Web site AllThingsD reported last year that Facebook and HTC had entered a partnership to create a smartphone, code-named “Buffy,” which is still in the works.
