human: Given a node-centered hypergraph: <hypergraph>, where nodes represent papers and hyperedges represent sets of papers co-cited by a source paper.

Details of the hypergraph:
Center node: "tor users contributing to wikipedia just like everybody else"
  Abstract: User-generated content on sites like Wikipedia is produced by volunteers who not only create content, but invest time and effort in quality control by reviewing others' contributions. Because of a perception that privacy enhancing tools are a source of vandalism, spam, and abuse, many user-generated sites like Wikipedia block contributions from anonymity-seeking editors who use proxies like Tor. While blocking anonymity seeking editors is perceived to be effective in stemming abuse, collateral damage in the form of unrealized valuable contributions from anonymity seeking editors is typically invisible. Although Wikipedia has taken steps to block contributions from Tor users since as early as 2005, we demonstrate that these blocks have been imperfect and that tens of thousands of attempts to edit on Wikipedia through Tor have been successful. We draw upon several data sources to measure and describe the history of Tor editing on Wikipedia over time and to compare contributions of Tor users to other groups of Wikipedia users. Our analysis suggests that the Tor users who manage to slip through Wikipedia's ban contribute content that is similar in quality to unregistered Wikipedia contributors and to the initial contributions of registered users.

Question: Please tell me which class the center node belongs to. The 40 classes are: cs.NA(Numerical Analysis), cs.MM(Multimedia), cs.LO(Logic in Computer Science), cs.CY(Computers and Society), cs.CR(Cryptography and Security), cs.DC(Distributed, Parallel, and Cluster Computing), cs.HC(Human-Computer Interaction), cs.CE(Computational Engineering, Finance, and Science), cs.NI(Networking and Internet Architecture), cs.CC(Computational Complexity), cs.AI(Artificial Intelligence), cs.MA(Multiagent Systems), cs.GL(General Literature), cs.NE(Neural and Evolutionary Computing), cs.SC(Symbolic Computation), cs.AR(Hardware Architecture), cs.CV(Computer Vision and Pattern Recognition), cs.GR(Graphics), cs.ET(Emerging Technologies), cs.SY(Systems and Control), cs.CG(Computational Geometry), cs.OH(Other Computer Science), cs.PL(Programming Languages), cs.SE(Software Engineering), cs.LG(Machine Learning), cs.SD(Sound), cs.SI(Social and Information Networks), cs.RO(Robotics), cs.IT(Information Theory), cs.PF(Performance), cs.CL(Computation and Language), cs.IR(Information Retrieval), cs.MS(Mathematical Software), cs.FL(Formal Languages and Automata Theory), cs.DS(Data Structures and Algorithms), cs.OS(Operating Systems), cs.GT(Computer Science and Game Theory), cs.DB(Databases), cs.DL(Digital Libraries), cs.DM(Discrete Mathematics). Directly output the class name.

gpt: cs.SI(Social and Information Networks)