Apple executives, Facebook billionaires endorse tech diets

Early Facebook investor Roger McNamee says the company needs to make fundamental changes. (Dreamstime)

At Google, some employees use a tool that restricts time spent on e-mail. A senior Apple Inc executive said his wife used a device that sets iPhone and iPad limits for their children. 

Members of a venture capital firm meditate before phone-free quarterly meetings. Slava Rubin, co-founder of crowdfunding site Indiegogo, has a strict no-screen policy for gatherings and adopted a similar rule for his bedroom.