I was on my office computer(the one I am typing this on) this morning.
I was ordering a tube for my lawn tractor tires.
Less than a minute later I picked up my Google Pixel smartphone and there was an add on Facebook for tractor tires.
I did not speak verbally at all. I never use that work computer for any social media sites.
These two computers only share the same email account number.
So, how did they communicate ?
Probably cookies.
Did you do a Google search for the tube? And do you have any Google accounts (like gmail, or youtube) that both the browser and the phone know how to log into?
Data moves around constantly. Trying to stop it is a fools errand.
During the conversation my phone, which was just sitting on the desk, came on with ads for cat food that lowers the risk of UTIs.
No lie. The phone listens.
Sometimes my wife and I will see something on TV and we discuss some movie.
Later I see the movie being broadcast.
Why would you have FB on a telephone?
The software from Google prompts you to ask if you want to sync your devices which is cute because they're already synced - you just don't see it until you click "yes".