Methods and apparatus to determine impressions using distributed demographic information

1. A method to monitor media exposure, the method comprising:

sending, from a first internet domain to a client computer, a response to a first request indicative of access to media at the client computer, the response to instruct the client computer to send a second request to an intermediary associated with a sub-domain of a second internet domain, the second request to be indicative of the access to the media at the client computer, wherein the intermediary is to, in response to determining that the second request does not include a cookie associated with the second internet domain, send a second response to the client computer, the second response to instruct the client computer to send a third request to a second intermediary associated with a second sub-domain of a third internet domain, the third request indicative of the access to the media at the client computer; and

logging an impression of the media.

2. A method as defined in claim 1 , wherein the second request includes the cookie associated with the second internet domain.

3. A method as defined in claim 1 , further comprising receiving a notification from the intermediary indicative of whether the client computer transmitted the cookie to the intermediary.

4. A method as defined in claim 1 , wherein the intermediary is to transmit an indication of the second request to an entity of the second internet domain.

5. A method as defined in claim 4 , wherein the indication of the second request includes an identification of the cookie.

6. A method as defined in claim 4 , wherein the indication of the second request includes an advertising campaign identifier.

7. A method as defined in claim 4 , wherein the intermediary is to transmit to the entity an indication of a third request indicative of access to the media by a second client, wherein the indication of the third request is transmitted with the indication of the second request.

8. A method as defined in claim 1 , wherein the response includes an identification of the cookie associated with the first internet domain.

9. A method to monitor media exposure, the method comprising:

sending, from a first internet domain to a client computer, a response to a first request indicative of access to media at the client computer, the response to instruct the client computer to send a second request to an intermediary associated with a sub-domain of a second internet domain, the second request to be indicative of the access to the media at the client computer;

instructing the intermediary to receive the second request associated with the sub-domain of the second internet domain;

instructing the intermediary to extract a cookie and an identifier associated with the media from the second request; and

instructing the intermediary to transmit the cookie and the identifier to an entity of the second internet domain; and

logging an impression of the media.

10. A system to monitor media exposure, the system comprising:

an impression monitor of a first internet domain to:

send, from the first internet domain to a client computer, a response to a first request indicative of access to media at the client computer, the response to instruct the client computer to send a second request to an intermediary associated with a sub-domain of a second internet domain, the second request to be indicative of the access to the media at the client computer, and

log an impression of the media; and

the intermediary to, in response to determining that the second request does not include a cookie associated with the second internet domain, send a second response to the client computer, the second response to instruct the client computer to send a third request to a second intermediary associated with a second sub-domain of a third internet domain, the third request indicative of the access to the media at the client computer.

11. A system as defined in claim 10 , wherein the second request includes the cookie associated with the second internet domain.

12. A system as defined in claim 11 , wherein the indication of the second request includes an identification of the cookie.

13. A system as defined in claim 10 , wherein the impression monitor is to receive a notification from the intermediary indicative of whether the client computer transmitted the cookie to the intermediary.

14. A system as defined in claim 10 , wherein the intermediary is to transmit, with the indication of the second request, an indication of a fourth request indicative of a second access to the media.

15. A system as defined in claim 14 , wherein the second access to the media is associated with a second client.

16. A storage device or storage disc comprising instructions that, when executed, cause a machine to at least:

send, from a first internet domain to a client computer, a response to a first request indicative of access to media at the client computer, the response to instruct the client computer to send a second request to an intermediary associated with a sub-domain of a second internet domain, the second request to be indicative of the access to the media at the client computer, the intermediary to, in response to determining that the second request does not include a cookie associated with the second internet domain, send a second response to the client computer, the second response to instruct the client computer to send a third request to a second intermediary associated with a second sub-domain of a third internet domain, the third request indicative of the access to the media at the client computer; and

log an impression of the media.

17. A storage device or storage disc as defined in claim 16 , wherein the second request includes the cookie associated with the second internet domain.

18. A storage device or storage disc as defined in claim 16 , wherein the instructions further cause the machine to receive a notification from the intermediary indicative of whether the client computer transmitted the cookie to the intermediary.

19. A system to monitor media exposure, the system comprising:

an impression monitor of a first internet domain to:

send, from the first internet domain to a client computer, a response to a first request indicative of access to media at the client computer, the response to instruct the client computer to send a second request to an agent associated with a sub-domain of a second internet domain, the second request to be indicative of the access to the media at the client computer, and

log an impression of the media; and

the agent to:

receive the second request associated with the sub-domain of the second internet domain,

extract a cookie and an identifier associated with the media from the second request,

transmit the cookie and the identifier to an entity of the second internet domain, and

transmit an indication of the second request to an entity of the second internet domain.

20. A storage device or storage disc comprising instructions that, when executed, cause a machine to at least:

send, from a first internet domain to a client computer, a response to a first request indicative of access to media at the client computer, the response to instruct the client computer to send a second request to an agent associated with a sub-domain of a second internet domain, the second request to be indicative of the access to the media at the client computer;

instruct the agent to receive the second request associated with the sub-domain of the second internet domain;

instruct the agent to extract a cookie and an identifier associated with the media from the second request; and

instruct the agent to transmit the cookie and the identifier to an entity of the second internet domain; and

log an impression of the media.