1. Criminals use Facebook in five main ways: hacking accounts using password cracking tools; commandeering accounts using stolen login credentials; cloning profiles by copying users' photos and details; creating fake Facebook pages to steal login credentials through phishing; and mining unprotected personal information posted by users. 2. Profile cloning allows criminals to assume a user's identity and access their friend list, while fake Facebook pages are used to steal login credentials through phishing scams. 3. Modern private investigators need to be aware of computer crimes on social media and how legislation in New Zealand prohibits unauthorized access to computers and criminalizes identity theft and other cybercrimes.