Arianna Huffington to leave Huffington Post to focus on start-up

Huffington Post co-founder Arianna Huffington said on Thursday she would step down as editor-in-chief of the news site that bears her name to focus on running her new venture, health and wellness startup Thrive Global. Huffington said on Twitter that she thought the Huffington Post, which made its debut in 2005, would be "my last act" but now wanted to concentrate on the new venture. In June, Huffington, 66, who recently wrote books on health and sleep-related issues such as "Thrive" and "The Sl