How does Pollfish make sure a respondent only answers a survey once?

We identify each device with non-PII data like device id. This also allows us to provide users with the ability to start a survey in one app and complete the survey where they left off in another app.

Also, Pollfish has a set of sophisticated abuse prevention algorithms like straight-lining detection and speed survey detection to further ensure that respondents are only answering a respective survey once.

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