Is this the downfall of the tech barons? The arrest of Russian messaging billionaire Pavel Durov has struck a blow against the power of big tech. Some hope this will be the start of a huge transformation.
Billionaire with 100 children charged
Chill wind: Pavel Durov, the founder of Telegram, was arrested in France last week for aiding and abetting crimes including child abuse, drug trafficking and money laundering. Glossary
Le Bourget - A town in the Paris region.
Telegram - Today: an encrypted instant messaging app. In the past: a message sent via electric wires and delivered as a printed piece of paper. As every word was expensive, making the message as short as possible became an art. A famous joke telegram sent from Venice read, "STREETS FULL OF WATER PLEASE ADVISE".
Encryption - A way of scrambling data so that only certain people can understand it.
Meta - The new name of the company which owns Facebook and Instagram.
Islamic State - A terrorist organisation that captured whole swathes of territory in Iraq and Syria in 2014, and launched a series of attacks in Europe and North America. It is also known as ISIS or ISIL.
Far-right - A range of ideologies that emphasise social order, racial purity and the elimination of opponents.
Disinformation - False information intended to mislead, including propaganda, which all too often encourages the spread of misinformation, fake news spread by mistake. It is contrasted with misinformation, which may be spread accidentally.
Censorship - Preventing or stopping speech, writing or communication that is considered harmful or "inconvenient".
Whistleblower - Someone who exposes secretive behaviour by a group or organisation; once used to describe police who blew whistles to signal the scene of a crime.
YouGov - A British public opinion and polling company. It was co-founded by Nadhim Zahawi, a Conservative Party politician.
EU - European Union. An economic and political union of 27 countries.
Elon Musk - A South African-born entrepreneur whose companies have included the online payment service PayPal. He now controls Twitter, renamed 'X'.
Canny - Being shrewd, astute, or having good judgment, especially in financial or business matters.