The 1st Social Data on the Web workshop (SDoW2008), co-located with the 7th International Semantic Web Conference (ISWC2008), aims to bring together researchers, developers and practitioners involved in semantically-enhancing social media websites, as well as academics researching more formal aspect of these interactions between the Semantic Web and Social Media. Since its rst steps in 2001, many research issues have been tackled by the Semantic Web community such as data formalism for knowledge representation, data querying and scalability, or reasoning and inferencing. More recently, Web 2.0 o ered new perspectives regarding information sharing, annotation, and social networking on the Web. It opens new research areas for the Semantic Web which has an important role to play to lead to the emergence of a Social Semantic Web that should provide novel services to end-users, combining the best of both Semantic Web and Web 2.0 worlds. To achieve this goal, various tasks and features are needed from data modeling and lightweight ontologies, to knowledge and social networks portability as well as ways to interlink data between Social Media websites, leveraging proprietary data silos to a Giant Global Graph. This volume includes the papers presented at the 1st Social Data on the Web workshop (SDoW2008), co- located with the 7th International Semantic Web Conference (ISWC2008), in Karlsruhe, Germany, October 27th, 2008.