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It's something that's possible to do on a lot of 'forum' type implementations. Another forum I go to allows this with certain restrictions. For an image board it's slightly pointless imo.

From my understanding, there's a display name, which is what people see, and then there's a user ID, which is static. The display name can be shown as whatever you allow it. The ID is what the database refers to for any information. So long as the service knows that name == id it doesn't really matter.