FB might not have that right, in practice, if the poster feels that their posts are their own. My "wall" is not generally referred to as "FB's wall documenting

FB might not have that right, in practice, if the poster feels that their posts are their own. My "wall" is not generally referred to as "FB's wall documenting ISL's interaction with friends", but rather, "ISL's wall". If a society believes a thing to be true, it will tend to vote in politicians to make it so, whether it is presently contractually written that way or not.