When foursquare works with Open Graph after the user has verified their application (and assuming the specified user is connected to Facebook), the four columns publish a sample of the validation data in Open Graph. Interestingly, they do not have a standard card. Their map has a dot on it at which the annotation adds a custom image. It looks something like this:
I'm curious how this is done? I can get a regular map to show it with a dot or a simple representation of the image, but I can’t get this custom annotation built into the map view.
From what I can say, there is nothing in the documentation that indicates further customization of the map layout or the addition of any additional metadata to the GeoPoint object to get this additional functionality.
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