https://www.theguardian.com/business/2018/aug/04/trillion-dollar-question-tech-giants-keep-growing-facebook-apple-google-netflix-spotify-twitter-amaz

A startling stock-market landmark for Apple has been offset by big falls for Facebook and Twitter. Is this tumultuous period just a blip, or the first sign of trouble?

It has been a tumultuous couple of weeks for America’s high-flying technology stocks, even by their own unique standards. Their shares have been soaring since the start of the year, despite being buffeted by trade war fears as President Trump talked of limiting Chinese investments in the US and restricting American technology imports to China.