[archgoon]

Several of the referenced papers from the article seek to address this question:

"Evaluating Online Labor Markets for Experimental Research: Amazon.com's Mechanical Turk"

https://www.jstor.org/stable/23260322?mag=amazons-mechanical...

"Socially Mediated Internet Surveys: Recruiting Participants for Online Experiments"

https://www.jstor.org/stable/43284764?mag=amazons-mechanical...