Facebook assigns each new user a unique identification number. You use this identification number in the Facebook URL to find a user. The user's profile displays, and you can submit a Facebook friend request or read the user's Wall posts using the identification number in the URL's "ID" querystring.
Video of the Day
Open a Web page, and navigate to the Facebook main website at facebook.com.
Log in to your Facebook account. In the upper-left corner click your name next to your Facebook Wall photo. Notice the URL contains your Facebook ID.
Replace your Facebook ID in the URL with your friend's ID. The following URL is an example of a Facebook URL with a user's ID inserted in the "ID" value:
Replace "100001222333" with your own ID.
Press "Enter" to navigate to the user's Facebook Wall.