Pretty sure if we started digging, close to 87% (and I'm probabaly being generous) of the research methodology used in these kind of base level study, would be highly suspect.
I suspect you are right.
There's a reason that real scientific studies and papers have to go through months of peer reviews, analyses, editing, corrections, etc, before even coming close to being published, and even then, some fairly dubious stuff can slip through and retractions have to be issued at a later date. In an unregulated space such as this one, anyone can perform any "study" with any methodology they like, and they'll find some news source to publish their findings, or even just via some social media such as medium, twitter or reddit.
There are a number of studies (ironic?) which show that around 60-70% of people only read the news headline, and don't even read the article they are sharing or discussing. It must be a tiny number, then, who click through to the original study the article is discussing, and a vanishingly small number who read the study in enough depth to try to ascertain its validity.
In short, you can publish just about anything and people will believe it.