This listing, I hope, may help you find the right social bookmarking service and understand the different kinds that exist. (exempt for some Specialized bookmarking, I have mainly limited this list to web pages, HTML. Not videos like dabble, maps like Tagzania, rss like wigzag...).
J. De Koster, T. Van Cutsem, und W. De Meuter. Proceedings of the 6th International Workshop on Programming Based on Actors, Agents, and Decentralized Control, Seite 31--40. ACM, (2016)