Methods and apparatus to collect distributed user information for media impressions

A method, comprising:

• storing, in memory, a logged media impression for a media identifier representative of media accessed via the Internet;
• causing, by executing an instruction with a processor, transmission of a device identifier or a user identifier to a database proprietor when a user has not elected to not participate in third-party tracking corresponding to online activities;
• accessing, by executing an instruction with the processor, user information from the database proprietor based on the device identifier or the user identifier;
• logging, by executing an instruction with the processor, a demographic impression based on the media impression and the user information;
• and
• generating, by executing an instruction with the processor, an impression report corresponding to the media based on the demographic impression.

A non-transitory computer readable medium comprising machine-readable instructions that, when executed, cause a server to at least:

• store a logged media impression for a media identifier representative of media accessed via the Internet;
• cause transmission of a device identifier or a user identifier to a database proprietor when a user has not elected to not participate in third-party tracking corresponding to online activities;
• access user information from the database proprietor based on the device identifier or the user identifier;
• log a demographic impression based on the media impression and the user information;
• and
• generate an impression report corresponding to the media based on the demographic impression.