It's not clear whether Twitter will also bow to pressure to conduct a more thorough investigation of Brexit-related disinformation. At the time of writing the company had not responded to our questions either. At the end of last year committee chair Damian Collins warned both companies they could face sanctions for failing to co-operate with the committee's enquiry -- slamming Twitter's investigations to date as "completely inadequate", and expressing disbelief that both companies had essentially ignored the committee's requests... Independent academic studies have suggested there was in fact significant tweet-based activity generated around Brexit by Russian bots."
Theresa May has said Russia's attempts to "sow discord" in the West could not go unchallenged, and warned Vladimir Putin, "We know what you are up to."
Facebook's response complained that a new investigation "requires detailed analysis of historic data by our security experts, who are also engaged in preventing live threats to our service."