“Nature shows us only the tail of the lion. But I do not doubt that the lion belongs to it even
though he cannot at once reveal himself because of his enormous size.”–Albert Einstein The …

Academic social network sites A cademia. edu and R esearchGate, and reference sharing
sites M endeley, B ibsonomy, Z otero, and C ite UL ike, give scholars the ability to publicize …

With the development of sophisticated e-learning environments, personalization is
becoming an important feature in e-learning systems due to the differences in background …

Personalized recommender systems are confronting great challenges of accuracy,
diversification and novelty, especially when the data set is sparse and lacks accessorial …

Social bookmarking systems are becoming increasingly important data sources for
bootstrap** and maintaining Semantic Web applications. Their emergent information …

Social resource sharing systems like YouTube and del. icio. us have acquired a large
number of users within the last few years. They provide rich resources for data analysis …

Social tagging systems have grown in popularity over the Web in the last years on account
of their simplicity to categorize and retrieve content using open-ended tags. The increasing …

Social resource sharing systems are central elements of the Web 2.0 and use the same kind
of lightweight knowledge representation, called folksonomy. Their large user communities …

The enormous increase of popularity and use of the worldwide web has led in the recent
years to important changes in the ways people communicate. An interesting example of this …

Social bookmarking tools are rapidly emerging on the Web. In such systems users are
setting up lightweight conceptual structures called folksonomies. Unlike ontologies, shared …