RecSpread is a state of the art recommender system engine, which can be used as a free, but limited web service. The service is hosted at the Vienna University of Technology and is opened for the public for research purposes.
Involves social network (Facebook, Twitter, ...) into the process of generating recommendations.
Utilizes item descriptions with its built-in semantic analyzer.
The web service is self-described and is based on service discovery. By opening the root URL of the service, one can find detailed information about the functionality of the service.
The service is published as the part of a research project.
You can use it AS-IS and without any warranty or SLA.