Most Donate Button posts are private - when a user posts in Facebook the default is that their posts will only be seen by their friends. This means that most of the time when someone adds your donate button to their post you are unable to see it. Unfortunately you will never know who this person is.
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Treat these like a street bucket collection. You collect these funds but don't have access to them to ask for their contact data.
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We have written this article to help you understand what you can do with Donate Button posts.
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