No they are not exactly tracking us. They are searching for relevant nouns and phrases in the topics, in this case, or other items that peple may search for. They don't always get it right but most of the time you find what you are looking for because these "spiders" have found it and cataloged it for you.

For example Google "Morgan plus 4 radiator" and you get links to a lot of relevant web pages, including,fairly early in the list, a link to this forum.

Peter

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