Here’s the Answer to the Question posted on Facebook
Q. What is tailgating?
A. The practice of following closely behind someone else without using credentials
B. The practice of securing an area with a turnstile
C. The practice of looking over someone’s shoulder to read information on a computer screen
D. Method of biometric authentication
Answer available until February 24, 2016.
See Chapter 26 of the CompTIA A+ Training Kit (ISBN 978-0735662681) by Darril Gibson.