OREANDA-NEWS. March 25, 2016. CEO Marissa Mayer is facing her biggest battle yet: demands by an activist investor group called Starboard Value to replace Yahoo's entire board of directors, including Mayer herself. Starboard said in a letter to Yahoo shareholders Thursday that it instead wants a new group of people to oversee a "turnaround plan, separation, or sale of assets."

A former Google executive who took the helm at Yahoo in 2012, Mayer has been criticized for a number of moves she's made to bring Yahoo back to relevance, so Starboard has plenty of ammunition.

Just look at Yahoo Screen, the company's premium video service, which was shut down in January. Yahoo admitted it couldn't find a way for the service to make money, even with the help of newly produced programming including a revival of the NBC cult comedy "Community." The company admitted the slate of shows sucked up \\$42 million from its coffers.

That's just one of many missteps that has highlighted Yahoo's failed efforts to keep up with rivals like Facebook, Google and Snapchat. Yahoo still has a large audience -- it claims 1 billion people visit all its sites combined per month -- but it hasn't found ways to make that pay, and it hasn't been able to find a sure footing with its products.