Unless your employer is government, police etc. currently not likely. However many employers require police checks, or working with vulnerable people/children checks etc. so may not have direct access to that data, but indirect. But as gumby says, much easier to track someone's social media presence. so many people just give it away without a care or remuneration (case in point, the amount of amateur porn/nudes there is online). Just remember if what you get is (product/service) is free, YOU are the product.