friend requests you

When someone "Friend Requests You" on Facebook, I click "Do you know ----." What is this? I recently removed some people from a block list and they added me back. As a lie, I simply clicked on the message "do you know this person" and then I was prompted with a message saying "this person can...

When someone "Friend Requests You" on Facebook, I click "Do you know ----." What is this? I recently removed some people from a block list and they added me back. As a lie, I simply clicked on the message "do you know this person" and then I was prompted with a message saying "this person can...