Definitely sends false info as to what kind of products you might like to buy, and maybe what kind of products are worth advertising on the sites you visit, but personally I’d rather send the message “I’m not at all interested, ignore me”

Doesn’t that mean even more agents will know what websites you visit?

When was that?

Makes sense if there are. Facebook knew my phone number in advance without me having provided it. Enough friends had given permission to access their contacts that they pretty much knew who I was in advance