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Text chat, Twitter or Facebook streams, can be used for live questions and answers, during an event (even if the presentation itself was previously recorded).
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Screen sharing, or desktop sharing: PowerPoint slides (or anything the presenter currently has shown on their screen) can be presented to the audience while the presenter discusses slide content.
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Live or Streaming video – using a webcam and microphone, video and audio are broadcast to the audience (up to six locations).
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