So called "Identity Graph" or "Identity Resolution" providers integrate with thousands of CRM systems and harvest the customer data in bulk, then sell the combi

So called "Identity Graph" or "Identity Resolution" providers integrate with thousands of CRM systems and harvest the customer data in bulk, then sell the combined profiles back to the companies integrating them. Get an API access, provide one piece, like a phone number, and they resolve it to names, home addresses, email addresses, social media usernames and so on. I mean i don't like facebook, but this topic is small fish