https://apnews.com/08614d92fadc5740cf49d81e596fa972 > OAKLAND, Calif. (AP) — For a preview of the future of office work, watch how the biggest tech companies are preparing for a post-pandemic world. > Silicon Valley and Seattle giants — Facebook, Microsoft, Apple, Twitter — were the first to send their employees home as the virus spread to the U.S. Now they're among the last to return them to the office. Some of their employees might never go back.