The blue social bookmark and publication sharing system.
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VideoTag is a fun one player tagging game. Tag some of the funniest videos on the internet, avoid the pitfalls and progress to the next level. See if you can make the top of the leaderboard and become the ultimate video tagger.
BibSonomy is offered by the KDE group of the University of Kassel, the DMIR group of the University of Würzburg, and the L3S Research Center, Germany.