“Has No Friends”: Amazon Is Keeping Amazingly Detailed Records on Its Customers and They Are Downright Insulting: Here's how to check yours.

This definitely seems to be US-based at the moment. The relevant page doesn't exist on the Australian site, but if I log into the Amazon US site, it is there (albeit blank in my case, which is interesting).

It’s in the UK version. On iPhone: You --> Account (along the top) --> Your Shopping preferences (under Personalization) --> About You (at the bottom).