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In the context of technology enhanced learning, digital educational resources are widely used for supporting a wide range of educational activities. Thus, organizing, managing, offering and accessing these resources over the web have been a key issue for our community. Emerging Web 2.0 applications and user attitudes and, especially, the user participation in content generation has increased the amount of user generated educational resources on the web. As a result, the issue of the social tagging of these resources, beyond pre-defined metadata schemas, has been raised. In this paper we discuss the issues related to social tagging as a means for describing digital educational resources and present ASK learning objects social tagging 2.0 (ASK-LOST 2.0) a Web-based tool that can be used for social tagging digital educational resource of various types.