Have you ever feigned illness and called in sick to work, only to have your boss uncover your lie because of something you did on Facebook?
Have you ever told family or friends you'd be in one place, only to have them take a peek at your Facebook page to find that you'd actually been somewhere else?
Worse, have you learned of a partner's infidelity or a friend's betrayal through Facebook or another social networking site?
If you've been caught -- or have caught others -- in white lies (or worse) on Facebook, ABC News wants to hear from you.
Please share your story by filling out the form below. Part of your response may be used in a future ABC News story, or an ABC News producer may contact you for more information. Please be sure to include your telephone number.