[Snowybear]

WSDL is old as is SOAP. They’re likely using some native web API.

[Old Teufel Hunden]

"WSDL is old as is SOAP. They’re likely using some native web API."

It may be old, but I can tell you as a programmer there are a lot of systems out there that provide access to retrieve and send data via xml using WSDL. I don't write any code to access facebook, but other major systems do use it.