Yahoo purchased Flurry, a mobile app analytics company, for hundreds of millions of dollars. Flurry collects detailed third-party user profiles showing what apps people use and how they use them. This user data has enabled companies like Facebook to charge higher prices for mobile ads. Yahoo views Flurry's audience data as valuable for improving its own mobile advertising business and competing with Facebook and Google. The acquisition allows Yahoo to potentially double conversion rates and in-app engagement through more targeted mobile ads.