> You may believe Faceache broke electoral law in the UK; but they have neither been charged nor convicted. So your belief would be false.

You are correct that they haven't (been charged with having) broken electoral law in the UK, but they have broken data protection laws in relation to the information which was then used by Cambridge Analytica:

https://www.theguardian.com/technology/2018/jul/11/facebook-...

Whether that information was then used by Cambridge Analytica as part of a Brexit campaign is open to more questions.