In the same trip, Mr Zuckerberg made a "surprise" visit to one of the company's arranged hack-a-thons to meet local developers.

BBC: North America

Would we indulge in still more talk-a-thons like those of the last two-plus years led by the European Union 3 (Britain, France and Germany) - for which the Iranians have publicly expressed appreciation as "buying time" for their nuclear program?

CENTERFORSECURITYPOLICY: Mortal threat