In a statement, Mr Giustra's lawyers said he had "started this action because he wanted to hold Twitter accountable in circumstances where it knew about defamatory, hateful and threatening tweets made on its platform by anonymous users but refused to remove them".
In court, Mr Giustra claimed he had been targeted in these posts for "political purposes". According to the bizarre pizzagate theory popularised during the 2016 US presidential election, former Secretary of State Hillary Clinton - then the Democratic presidential candidate and her inner circle - were running a secret sex ring out of the DC pizza restaurant. Mr Giustra contended that he had been linked to the conspiracy in relation to his support for the Clintons' charitable foundation.