At the end of a year ago 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. The investigation, however, was limited to a cluster of Russian accounts that had already been identified following probes into activity connected with the United States presidential campaign.
Facebook will expand its investigation into whether Russian agents attempted to influence the Brexit vote.
The social network will now look for "other similar clusters engaged in coordinated activity around the Brexit referendum that was not identified previously". "They are best placed to investigate activity on their platform".
The Russian government has repeatedly denied any involvement either in the election of Donald Trump in the United States or Brexit in the UK.
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In aid of an Electoral Commission investigation, last month Facebook announced that a meager 70p ($0.97) had been spent by a Russian-based company called "Internet Research Agency".
Facebook has widened its investigation into possible Russian interference in the European Union referendum.
Facebook is expanding a United Kingdom investigation into possible interference by Russian Federation ahead of the country's 2016 election to exit the European Union, after facing pressure from lawmakers who were unsatisfied with an earlier probe by the social media company.
The social media giant had already searched for signs of interference from the Internet Research Agency, which is linked to the Kremlin and located in St Petersburg.
The social media company originally claimed it had only spent $1 on advertising towards voters in the United Kingdom, but Collins said the investigation did not go far enough as it didn't look at other sources.