The act of trimming or grooming ones Facebook wall by deleting multiple and/or embarrassing comments or posts from the same friend, thus preventing older posts from "falling off" the page and thereby giving the impression that the individual has recently been interacting with a large and diverse group of friends and not just one overly-communicative friend or family member.
See also tweetscape
Jim's Facebook wall was in desperate need of a wallscape to remove his mother's frequent inquires about the status of his "bedwetting issue" so that his profile would better reflect the cool Freshman he saw himself as.