I would say yesterday, potentially. Saw an ad for totally watertight running shoes, which was not something I thought existed. Haven't looked into the product enough to buy them, but it's a good bet I will, and they would be of great utility to me.
This is never an argument for unsolicited advertising and user tracking, though.
I.e. you could have achieved the same by explaining your needs to some shop or service. Just tell them that you are a runner and want relevant ads in your mailbox. No need to tell them about the rest of your life.
