Information targeted includes information about you, and indirectly through you, information on others that you interact with.
Any information that may assist in better profiling you is gathered by persons wishing to exploit you. Learning more about you enables another person to better emulate you, and even replicate your authenticators through analysis, guesswork and deduction. Working out your passwords, answers to security questions, and information relating to your family, friends, associates and interests.
Where you go, where you shop or work may be tracked through monitoring and analysis of location data. What you post about yourself, or share in your online profiles, provides information threads to follow.
You can act as a stepping stone, by providing information that gives access to a broader, targetable user base for exploitation purposes.
You have information, phone numbers, email addresses, home addresses, photographs and other information on people in your contacts database, as friends on social media services etc. Granting access or accidentally allowing access to your records is not fair to those whose information you have. Did they give you permission to share their information with others? How would you feel if your information is being shared without your permission?
By having your location and activity information in the public domain, you are at risk of sharing information, not only about yourself, but also information about those you engage with. People who have common interests, were mentioned or photographed as being in the same location as yourself. People referenced in your workplace or have links to your business, or professional history may be exposed. How do you feel if photographs or information about you are in the public domain, being shared without your permission or knowledge?