I had drinks with one of the $1 billion "unicorn" CEOs last night, in a trendy Noho bar in London. He told me he thinks we're in a tech bubble, and it's going to end badly for many companies.

Is the unicorn IPO bubble bursting? It might be. If it is, the turn will have been marked by the attempt to start the process of listing WeWork (technically The We Company) for a silly sum this month.