[tinkerteller]

That is a wrong analogy. FB does recommendations prominently luring in you to things that you didn't knew existed. It also filters and sorts to decide for you what information you get to see.

The correct analogy is having a secretory that reads all your emails and only selectively lets you know what you got as well as inserting recommendations based on her belief system. So if this secretory tells you that your brother only sends you bad emails and here's the great model of gun you should buy if you are going to meet him - then your secretory is not merely a tool to manage your emails.