Planet Fitness have a system that will send you mail simply if you visit their website. Steps to reproduce: * Search for a gym on Google maps. * Click a Plan

Planet Fitness have a system that will send you mail simply if you visit their website. Steps to reproduce: * Search for a gym on Google maps. * Click a Planet Fitness result that's somewhere nearby. * Expand to their website link, follow it, and browse several pages on their site. * Do NOT give them your email. * Wait a few days and check your email. * Watch your email through the next couple weeks for follow-up emails that continue to urge you to action. This will probably require you to use a browser with an extensive history. EG, not one with temporary container tabs or other such privacy considerations. Something you've used the email on in a variety of scenarios, enough to have it linked to your identity with some sufficiently large advertising agency. It's illegal, a complete violation of CANN SPAM act, but I imagine it makes them more money than they'd lose if they ever actually got slapped down. I just wonder which information provider they're using that has 'sold the goose', so to speak. By giving an email address they no longer sit between the company and the user's marketing efforts, so it must be fairly expensive to do. But it enables these kinds of follow-up campaigns.