Yahoo swept out Scott Thompson as CEO Sunday in an effort to clean up a mess created by an exaggeration about his education that destroyed his credibility as he set out to turnaround the long-troubled Internet company. Ross Levinsohn, who oversees Yahoo’s content and advertising services, is taking over as interim CEO. He becomes the fourth person to run Yahoo in eight months. Yahoo hired Thompson, the former head of eBay’s PayPal, in January to orchestrate a reversal. Though, Yahoo is one of the Internet’s most-visited websites, the company has struggled to grow in face of competition from the likes of Google and Facebook. The company’s difficulties have irked investors. Thompson took the helm as Yahoo’s fourth chief executive in less than five years.