A method for determining information related to an audience of an audio-visual content program of a television channel, the method comprising: monitoring at least a subset of the audience by receiving automated feedback of monitored hybrid television audience devices of the monitored subset of the audience, hybrid television being a technology combining a broadcasted program and an internet-protocol-based overlay for displaying website content; determining at least one conversion factor based on a relationship between a property value measured for the television channel within at least one previously monitored audience subset of hybrid television audience devices at a point in time and the corresponding property value of a previous audience of the television channel at the same point in time according to a panel, wherein one conversion factor represents the ratio between the size of the subset of the previously monitored audience of hybrid television audience devices and the corresponding total size of the audience at the point in time according to the panel; determining the information related to the audience based on the automated feedback received from the monitored hybrid television audience devices of the monitored subset of the audience, wherein the information related to the audience comprises measured metrics for the subset of the audience, including a net reach of the monitored subset of the audience; and estimating at least one property of the audience based on the at least one conversion factor and based on the information related to the audience that is determined based on the subset of the audience, wherein the at least one property of the audience includes the net reach of the audience that is estimated using the net reach of the monitored subset of the audience and the conversion factor representing the ratio between the size of the previously monitored subset of the audience and the corresponding total size of the audience according to the panel at the point in time. monitoring at least a subset of the audience by receiving automated feedback of monitored hybrid television audience devices of the monitored subset of the audience, hybrid television being a technology combining a broadcasted program and an internet-protocol-based overlay for displaying website content; determining at least one conversion factor based on a relationship between a property value measured for the television channel within at least one previously monitored audience subset of hybrid television audience devices at a point in time and the corresponding property value of a previous audience of the television channel at the same point in time according to a panel, wherein one conversion factor represents the ratio between the size of the subset of the previously monitored audience of hybrid television audience devices and the corresponding total size of the audience at the point in time according to the panel; determining the information related to the audience based on the automated feedback received from the monitored hybrid television audience devices of the monitored subset of the audience, wherein the information related to the audience comprises measured metrics for the subset of the audience, including a net reach of the monitored subset of the audience; and estimating at least one property of the audience based on the at least one conversion factor and based on the information related to the audience that is determined based on the subset of the audience, wherein the at least one property of the audience includes the net reach of the audience that is estimated using the net reach of the monitored subset of the audience and the conversion factor representing the ratio between the size of the previously monitored subset of the audience and the corresponding total size of the audience according to the panel at the point in time.