1. A computer-implemented method comprising: producing usage data associated with an online service, the usage data being associated with online service interactions; producing operational data associated with the online service, the operational data being associated with online service interactions; processing the usage data and the operational data to produce a measure of behavioral changes over time; correlating behavioral changes of the usage data and the operational data; and processing the correlated behavioral changes to recognize one or more events in which usage and operational behavioral changes deviate from historical data.