### Explanation Contact books (address books, contact lists) consist of an accumulation of individuals' names, phone numbers, email addresses, and other personal details. In the digital age, contact books have evolved from physical notebooks to digital databases stored in smartphones, email clients, and social media accounts. Contact books provide insights into: - An individual's social network and business connections - Communication patterns and relationships - Information about contacts based on stored names and details While accessing someone's contact book without permission is generally illegal (except for authorized law enforcement), there are some investigative techniques and information sources available through legitimate means. ### Examples - [GetContact: another threat to our privacy?](https://www.diggitmagazine.com/articles/getcontact-another-threat-our-privacy) ### Types - behavioural - technical ### See also - [[SOWEL-2. Producing Social Graph]] ### Typical techniques - [[SOTL-9.1. Import Contact]] - [[SOTL-9.2. Check Caller Identification Apps]]