When visiting a medical doctor’s office, a women’s health clinic, a therapist’s office, an addiction treatment center or a place of worship, many think that their location will be off limits to tech companies vying to sell the next thing to you.
But in reality, the unique personal data being collected is sold on the marketplace allowing companies to acquire a consumers’ precise geolocation for precision advertising.

For example, a Midwest anti-abortion group last year used cellphone location data to target online content to visitors of Planned Parenthood clinics, according to the Wall Street Journal.
When users clicked the targeted ads, they were directed to a site giving them options…