Yes, this is also serious threat. SEO and spamming affecting quality of search. Some years ago you could just type some scientific article's title and it would

Yes, this is also serious threat. SEO and spamming affecting quality of search. Some years ago you could just type some scientific article's title and it would have popped up good references and maybe the pdf version. Even you could find complete books like that and a little of refinement. Now it's all spam, at least for the first pages.