Social media giants can no longer expect to keep operating in a regulatory vacuum, says Parmy Olson for Bloomberg Opinion. LONDON: The recent arrest of Telegram founder and chief executive officer Pavel Durov at Le Bourget airport near Paris has sent shockwaves through the tech world. Elon Musk called on France to “free Pavel” to avert a threat to democracy; Paul Graham, the co-founder of leading Silicon Valley accelerator Y Combinator, suggested it would hurt the country’s chances of being "a