Given the amount of stupid ads I see I sometimes click one when I see something that is remotely interesting (dev tools etc), hoping to train googles AS (Artificial Stupidity) to serve me more relevant ads. (No, I'm still happily married and I cannot figure out why a company that sits on my personal email and most of my internet searches for the last 15 years cannot figure that out. Especially as I have even configured my ad preferences in the settings.)
I can't figure out why Zillow thinks I'd be interested in houses in Palo Alto. They regular send me emails about houses they think I might be interested in, and they are in the Palo Alto area.
The only reason they have my email address was because I made an account so I could claim my house on Zillow, so they know exactly where I live, and that is 850 miles from Palo Alto.