Wall-is where you will see what a friend posted on you all (in My profile, you will see some posts, combined with your personal information, but in the face of all of this is just a post that a friend posted on you).
Wall - an area where you can see what their friends post for you all (in My profile, you'll see some posts public on your profile. But in all this there's just post your post for you).
Wall - is an area where you'll see what a friend posted to you all (in My profile, you see your post some combined with your personal information. But on this page will be just post to post to you).