Every Classmates profile has a Yearbooks section that allows you to easily find out if we have a yearbook available from that member's school years, and if the member has been tagged in any yearbooks on the site. Look for the Yearbooks section when viewing another member's profile to check it out.
The same applies to your own profile—simply go to My Profile, found under your name/photo in the orange bar at the top of any page, and look for the Yearbooks section to quickly find any yearbooks that are available from your school years, plus any yearbooks you've been tagged in.