There does exist a site for uploading preprints called arXiv. The difference is that preprints aren't peer reviewed and thus aren't quite as citable in publications that strongly prefer "published sources with a reputation for fact-checking and accuracy".
Actually, in my experience this is not the problem, you can cite whatever you want. Considering this article, such reputation for fact-checking and accuracy does not really exist anyway (i.e. the higher the ranking of a journal, the higher the probability that articles have to be retracted). The real problem is, articles that do not appear in a journal count less or nothing on the authors curriculum, unless you are a genius like Grisha Perelman, who, AFAIK, published the proof of the Poincare conjecture only on arXiv.