The invisible force behind all of this is no mystery to anyone paying attention to the city's tech economy. San Francisco is home to some of the most valuable private companies in the world, and their employees have been quietly accumulating — and, increasingly, cashing out — fortunes.

Mysterious disappearance of man on popular WA hiking track sparks police search
<p>Samuel Whitsed, 27, is believed to have travelled from Victoria to hike Bibbulmun Track near outskirts of Perth</p><ul><li><p>Get our <a href="https://www.theguardian.com/email-newsletters?CMP=cvau_sfl">breaking news email</a>, <a href="https://app.adjust.com/w4u7jx3">free app</a> or <a href="htt


