How do you know which Craigslist Studies are legit?

Like, if a study doesn't list it's company name or physical address, just a survey link. How do you know it's legit and not just somebody trying to get your details?

submitted by /u/moistanybody
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source https://www.reddit.com/r/beermoney/comments/dy79lx/how_do_you_know_which_craigslist_studies_are_legit/