Zend certified PHP/Magento developer

Magento 1 – Are recently viewed products unique to the current user only?

I’ve been using the recently viewed block on the majority of Magento 1 websites I’ve created and I always thought the recently block was unique to the current user (guest or registered).

A client has noticed the recently viewed block is showing random products and it’s got me thinking the block is showing other customers recently viewed which would make it site wide instead of unique to the user.

Can anyone confirm whether it’s unique or site wide as I cannot see any issues with the setup (v1.9.3.6).