METHODS AND APPARATUS TO DETERMINE MEDIA IMPRESSIONS USING DISTRIBUTED DEMOGRAPHIC INFORMATION

Examples to determine media impressions using distributed demographic information are disclosed . An example apparatus includes a communication interface to receive a network communication at an impression monitor system based on a login event at a client device , the login event associated with an Internet – based service of a first Internet domain different from a second Internet domain of the impression monitor system . The example communication interface also sends a response to the client device , the response to cause the client device to include first and second cookie identifiers in a login reporting message and to send the login reporting message to a computer of a database proprietor that provides the Internet – based service , the first cookie identifier associated with the first Internet domain of the Internet – based service , and the second cookie identifier associated with the second Internet domain of the impression monitor system .