This could have all been fixed with a control group. It was an online survey, so presumably not hard to include a control Weird that they didn't, isn't it?
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You should do a survey of people in a Facebook group who all agree with you then publish it as if it's a scientific study


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I generally agree with you about the limitations (my thread about this here: https://twitter.com/hwitteman/status/993659878039261184 …). My view on the Facebook group is that it’s just another way to do snowball sampling. I’m not sure why it deserves particular censure?
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For a qualitative sample I'd be on the same page but it strikes me as a very poor strategy to get a sample for a quantitative piece of work
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