"Social Science Research Network (SSRN) is devoted to the rapid worldwide dissemination of social science research and is composed of a number of specialized research networks in each of the social sciences. (...) The SSRN eLibrary consists of two parts: an Abstract Database containing abstracts on over 531,900 scholarly working papers and forthcoming papers and an Electronic Paper Collection currently containing over 436,700 downloadable full text documents in Adobe Acrobat pdf format. The eLibrary also includes the research papers of a number of Fee Based Partner Publications."It seems to be more a repository than a social network like ResearchGate.
Februar 21, 2014
Februar 17, 2014
There's a couple of meta search databases, which promise a "deep web search":