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Facebook Open Graph
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You need to setup the correct image in order for the sharing to Facebook work correctly
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Here are some notes from Facebook
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Image Sizes
- Use images that are at least 1200 x 630 pixels for the best display on high resolution devices. At the minimum, you should use images that are 600 x 315 pixels to display link page posts with larger images.
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Small Images
- If your image is smaller than 600 x 315 px, it will still display in the link page post, but the size will be much smaller.
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Favicon.ico need to be replaced
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apple-touch-icon.png is a preview icon when user set a bookmark on their homescreen