I'm in the US. Online, I've obtained birth and death dates and lists of mailing addresses of specific persons. In one case, I started with the subject's name an

I'm in the US. Online, I've obtained birth and death dates and lists of mailing addresses of specific persons. In one case, I started with the subject's name and county where they died (the goal was to find the burial plot of a relative). Other cases I started with a name and current city of residence (ie, googling myself and family members). I didn't search social networks. Iirc, most of my success came from online county records.