Facebook publicly denies this. But... In my family we play a game where we have "mad lib" style conversations about obscure objects, travel destinations, food/recipes. And you get points for your subject coming up on your phone feed and double points if you can get your word on someone else's phone feed. It's not that hard. Start talking loudly with your FB or Insta app open about (example) Cruise Vacations in Alaska or Low Calorie Vodka. Make sure your topic is something you personally would not search, in my case I'd cut off me jewels before touching diet vodka! You get the point. Obscure enough that you wouldn't already be on a distribution list for the product or service, but common enough that there would be some ad content available if you wanted it. That's it. Just talk. It works.