1: When a person or another animal examines an area to see if there are any signs that people or animals have passed through it recently and try to figure out how many of them were there, what they were doing, and which way they went
2: When people monitor where a person or a particular object they are interested in, usually packages, is located
3: When an individual goes online to find more information about another person in order to understand them better. When they do this, they use publicly accessible information that does not require a people search website to get.

When early twenty-somethings start tackling life stage milestones very quickly