Hasn't the recent cycle shown the power of algorithms, whether we recognize their work? If fake news was less back in the "good ol days" of the Internet, it was because Google's PageRank was inherently biased towards sites maintained by organizations with the resources and brand names to have popular sites, e.g. news organizations.
If Facebook prioritizes shared stories in your news feed based by how many people shared it, then that makes it much easier for randomnewssite.biz to make it to your eyeballs via FB's ranking and filtering algorithm.