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Prolific - Quickly find high-quality survey participants
CashKarma - CashKarma app comes up with an opportunity for users to earn money through their phones.
Survey Junkie - Survey Junkie is an online community with over 10 million members dedicated to making your voice heard.
SurveyMini - SurveyMini app provides you with an easy way to share your thoughts and opinion about places that you visited.