I have come across (via Jane Hart's wonderful Pick of the Day), a great tool allowing you as a teacher or if your students are presenting in PowerPoint, a way of allowing the audience to interact with the presentation.
"The twitter tools allow presenters to see and react to tweets in real-time, embedded directly within their presentations, either as a ticker or refreshable comment page.
There are currently eight tools – you can easily cut and paste them into your own PowerPoint decks:
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PowerPoint Twitter feedback slides
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PowerPoint AutoTweet
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PowerPoint Twitter voting — bar charts and pie chart
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PowerPoint Twitter ticker bar
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PowerPoint Mood meter
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PowerPoint Crowd meter
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PowerPoint Zoom text
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The use of these tools will allow your WebQuest or your students' PPTs to become interactive in real time. Much learning can happen from these additions especially when your students are giving their presentations. You will need to have agreed protocols for this feedback but as the students are involved this challenge can be easily overcome.