comScore Media Metrix today released its monthly analysis of U.S. consumer activity at top online properties and categories for February 2007 and introduced a new suite of metrics based on site 'visits.' The 'visits' metric, defined as the number of times a unique person accesses content within a Web entity with breaks between access of at least 30 minutes, is a way of measuring the frequency with which a person views content, thereby illustrating a key component of user engagement. Included among the new suite of metrics are: total visits, average minutes per visit, average visits per visitor, and average visits per usage day.