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Amazon affiliate links have a URL component (in the path or GET variables) that match the glob "tag=*-20" (supposedly it could end with numbers other than 20 but I've never seen anything other than 20).

US is -20. Other countries have other numbers.

It's form the Amazon fb page, so no, I don't make any money in any case.

EDIT: to be precise, Amazon uk facebook page

Cool. Thanks

No prob

Nope. It's for source tracking.