Poll Everywhere
Poll Everywhere is a web-based polling platform that allows you to ask questions and view the responses of participants in real time. Participants can respond on the web or via a text message. Polls can also be integrated and launched from within PowerPoint, Keynote or Google Slides, and data reports of the responses can be downloaded once the session is ended.
"If you're younger than 13, you need your parents permission to use our service. ...Accordingly, children under the age of 13 may only use the Site or the Service with the permission and supervision of their parents. Additionally, teachers and schools seeking to use the Site or Service in the classroom with children under 13 years of age, are required to obtain the express consent of such children's parents in compliance with COPPA, prior to permitting such children to access or use the Site or Service."
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Homepage https://www.polleverywhere.com/
Poll Everywhere Support documents and videos can be found here: https://www.polleverywhere.com/support