### Explanation Users commonly reuse personal data across multiple online platforms to reduce cognitive load and simplify account management. This includes: - **Names**: Users frequently utilize their official names or passport names on various platforms. - **Email addresses**: Many individuals tend to use their main email address for several accounts. - **Usernames/Nicknames**: People often maintain the same usernames or nicknames across different services. - **Passwords**: It is common for users to employ identical or similar passwords, despite the associated security vulnerabilities. This pattern of behavior is often encouraged by the policies of these platforms, which: - Mandate the use of real names for account verification - Connect accounts across different services - Provide options for "Sign in with" existing accounts - Award verification badges solely for users with consistent identities ### Examples ![[password-reuse.png]] - 65% of users reuse passwords across multiple accounts ([source](https://au.pcmag.com/news/60692/you-probably-need-a-reality-check-about-cybersecurity)) - Research on username uniqueness and traceability: [How Unique and Traceable are Usernames?](https://arxiv.org/pdf/1101.5578.pdf) ### Types - behavioural - business ### See also - [[SOWEL-8. Using Nicknames]] ### Typical techniques - [[SOTL-6.1. Check Logins Reuse To Find Another Account]] - [[SOTL-6.2. Check Nicknames Reuse To Find Another Account]] - [[SOTL-6.3. Check Password Reuse To Find Another Account]]