How do you check who has sent you a friend request on facebook?

When you go to facebook.com, you will see, in the upper-left corner, the Word facebook, 3 dark blue icons, and then the search bar. In order from left to right, the icons mean Friend requests, Messages, and Notifications. If you have a friend request (or a message or notification) there will be a red box with a number inside it on top of whatever you have. Click on it and that is where your friend requests will be.