These people make up 90% of the online population (sometimes even 99.9% depending on the site); either way they are a huge majority – the mass of the unknown. Companies obviously like to make money from their websites – simple – but have found it hard to do so with these “listeners” as they don’t participate and therefore you don’t know what they like or what they don’t, how they think etc etc…

These people can only be tracked via a click, that’s their only trail. So can ...