Yahoo still has credibility issues, even after casting aside CEO Scott Thompson because his official biography included a college degree that he never received.

The troubled Internet company's next challenge will be convincing its restless shareholders and demoralized employees that the turnaround work started during Thompson's tumultuous four-month stint as CEO won't be wasted.

It won't be an easy task, given that Yahoo Inc. has now gone through four full-time CEOs in a five-year stretch marked by broken promises of better times ahead. Instead, Yahoo's revenue and stock price have sagged during a time when rivals such as Google Inc. and Facebook Inc. as advertisers spend more money online. Read more...