Yahoo CEO Marissa Mayer launched a series of acquisitions after becoming CEO in 2012. Tumblr was acquired for $1 billion. Yahoo has disclosed in a regulatory filing that it plans to write down the entire value of that acquisition. A number of other acquisitions have also failed to deliver value as Yahoo struggles in ad revenues- mobile ad revenues for Yahoo in the 1st quarter of 2016 were $250 million compared to $4.5 billion or 17 times that for Facebook. Yahoo has 200 million visitors each month, but its display ads are not strong on mobile and its mobile apps have not done well with users. As advertising shifted to mobile Yahoo stumbled badly. The failed acquisitions investment could have been better utilized in retaining talented mobile engineers, but Yahoo's CEO resorted to cost cutting when the strategy of looking at consumer trends for news content through digital magazine investments failed. As a result Yahoo suffered from slumping morale and a brain drain.