These are some additional videos about Foursquare.  These videos were not created by Foursquare, but are generally reliable.  (The person speaking in the first two videos also talks very fast!)

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https://www.youtube.com/watch?v=jKeph03Nfi0

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https://www.youtube.com/watch?v=fFjkwRiqj4g

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https://www.youtube.com/watch?v=hvKeySJ5jig