This guide provides links to (mostly) free resources online to find information about individuals including names and aliases, birth dates, addresses, criminal history, and employment.
Viewable information will be limited. Registering includes providing a name and e-mail address. The new Graph Search provides a lot of searching options.
Registration is required to see complete profiles. Employer information is often listed. Check your privacy settings to determine what information about you is shared when you view someone else's LinkedIn profile.