Monitoring is essential to see yahoo users and their behaviour online. Monitoring can cover many things that an application needs to function, like online/offline status, avatar changing, time, date, etc. Commonly measured metrics are avatar changing and status, but consistency and reliability metrics are gaining popularity. A media monitoring service provides clients with documentation, analysis, or copies of media content of interest to the clients. Services tend to specialize by media type or content type. For example, some services monitor news and public affairs content while others monitor advertising, sports sponsorships, product placement, video or audio news releases, use of copyrighted video or audio, infomercials, "watermarked" video/audio, and even billboards. This service monitors user behaviour.