I have an e-commerce website and I need to display products on the homepage based on user interest like advertisement showing on facebook and google based on the search we did on the internet.
Is there any API from facebook or google or any website for fetching user interests?
I have wondered how to facebook, google, and booking.com collaboratively tracking us even if they are different companies.
Is there any common gateway or common interface where these big companies share user info by making a system with cookies to track among all as a centralized big data model for behavioral advertising?
I am looking for answers from experts for this. I really need to build a system for tracking user interest based on their search on google and other websites.