Wall Street Journal: A hedge-fund investor in Yahoo is calling for an ouster of CEO Marissa Mayer and a drastic new plan to turn around the flailing Internet business. Eric Jackson, with SpringOwl Asset Management, said he has submitted a 99-page slide presentation to Yahoo outlining his plan to slash the company’s workforce by 75%, replace Mayer with an operations-focused CEO and bring in a strategic partner to help navigate tax issues surrounding its Asian assets.