Methods and apparatus to determine media impressions using distributed demographic information

A tangible computer readable medium comprising instructions that, when executed, cause a machine to at least:

• execute a reporter at a client device;
• send a communication to an impression monitor system in response to the reporter detecting at a client device a login event via the login webpage, the login event associated with a first Internet domain different from a second internet domain of the impression monitor system;
• and
• send a login reporting message to the database proprietor, the login reporting message including first and second cookie identifiers, the first cookie identifier associated with the first Internet domain, and the second cookie identifier associated with the second Internet domain of the impression monitor system.

A method to log media impressions, the method comprising:

• executing a reporter at a client device;
• sending a communication to an impression monitor system in response to the reporter detecting at the client device a login event via the login webpage, the login event associated with a first Internet domain different from a second internet domain of the impression monitor system;
• and
• sending a login reporting message to the database proprietor, the login reporting message including first and second cookie identifiers, the first cookie identifier associated with the first Internet domain, and the second cookie identifier associated with the second Internet domain of the impression monitor system.