Apparently, ResearchGate has been quite successful in amassing a digital depository of publications. A Science news article of October 6, 2017, reports that
Scholarly publishing giants Elsevier and the American Chemical Society (ACS) have filed a lawsuit in Germany against ResearchGate, a popular academic networking site, alleging copyright infringement on a mass scale. The move comes after a larger group of publishers became dissatisfied with ResearchGate’s response to a request to alter its article-sharing practices.An article in the news section of Nature provides more background on the publishers' concerns.
ResearchGate, a for-profit firm based in Berlin that was founded in 2008, is one of the largest social networking sites aimed at the academic community. It claims more than 13 million users, who can use their personal pages to upload and share a wide range of material, including published papers, book chapters, and meeting presentations. Science funders and investors have put substantial funds into the firm; it has raised more than $87 million from the Wellcome Trust charity, Goldman Sachs, and Bill Gates personally.