District judge James Boasberg says the claims are 'legally insufficient' and don't provide enough evidence that social media giant is a monopoly

Deal would see Mizrahi-Tefahot swallow up smaller bank; move was disqualified last year over anti-trust issues but appeals tribunal says not enough evidence to block takeover

Visit comes as Facebook faces a myriad of regulatory and legal questions surrounding issues like competition, digital privacy, censorship and transparency in political advertising