Can I collect participants emails to contact them later?

No. You are not permitted to ask participants for any personally identifiable information like emails, phone numbers, or addresses. 
 
However, you can ask for participants' Prolific email addresses, which will look like 594a5d31833f6d0001623f8a@email.prolific.co and can be used like a regular email to run multi part studies that require an email. Please read more about this feature here before utilising it in your study.
 
Prolific is committed to safeguarding the privacy of our website visitors, service users, and other individuals with whom we deal. As part of this commitment, we’re updating our privacy policy to meet the high standards of the new European data protection law, known as the General Data Protection Regulation (GDPR). 
 
Please note that we have a anonymous messaging system in place that allows you to contact participants. Also, for longitudinal studies, you can invite participants to your follow-up studies by using our White List feature
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