I think the access tokens expire after a while.

EDIT: Apparently the access token isn't necessary, but it can break things if it's there. The URL of this submission should be changed to omit the access token parameter. If that still doesn't work, the instructions below will give you a URL with a Facebook-generated access token that will eventually expire as well.

1) Go here: http://developers.facebook.com/docs/api#search

2) Click on the link to search all public posts for "watermelon".

3) Alter the URL to say "rectal surgery" instead of "watermelon".

His access token has likely temporarily or permanently expired from either [overuse in too short a time period] or [they expire after a set time period]. Before it showed the latest public posts by all people on facebook which included the words "rectal surgery"

just remove all the jibberish after "type=post" in the url and you will see message contents.

Just remove everything after the &access_token= part and it'll work. The access token has expired, but it's not even necessary to search for public posts.

That's what I see.