OCLC Search API with blank ISBN always returns The Social Network

From: Brice Stacey <Brice.Stacey_at_nyob> Date: Thu, 9 Jun 2011 16:02:24 -0400 To: CODE4LIB_at_LISTSERV.ND.EDU

When I query OCLC's Search API with a blank ISBN, I always get The
Social Network's soundtrack. Anyone want to take a guess at why that is
so? Here is the URL. You'll need to plug in your own wskey. 

http://www.worldcat.org/webservices/catalog/content/isbn/?servicelevel=f
ull&wskey=

I'm just surprised that it doesn't throw the usual "Record does not
exist" message. 

Brice Stacey