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"Social science" isn't a singular amorphous blob, and these methods aren't uniformly accepted.

Online surveys are certainly becoming more popular as they are significantly cheaper to conduct than the alternatives, and yield publishable results that garner media attention. There are peer reviewers that will be sympathetic to these issues, regardless of the method's robustness.

However, there are others that would say this reeks of dredging (p-hacking) in a very murky pool of data. Their "scepticism" rarely makes the New York Times (or a bestselling book), though.