They have been around a while, and likely do have some gaps or issues in their methodology, but they did invent the industry they operate in. As for the dead l

They have been around a while, and likely do have some gaps or issues in their methodology, but they did invent the industry they operate in. As for the dead link, I found it on Internet Archive; it redirects to this, which does work. https://global.nielsen.com/global/en/solutions/audience-measurement/ https://global.nielsen.com/global/en/solutions/audience-meas...