NY judge allows legal papers to be served via Facebook

Now, this is the New York Post, not the most reputable news source, but still....

Guy was trying to serve papers on his ex-wife who had moved and left no forwarding address, however, she was an active poster on FB. So the judge said 'go for it'. What I don't get is don't subpoena services have research resources that we mere mortals don't for tracking people down?

http://nypost.com/2014/09/18/judge-oks-serving-legal-papers-via-facebook/