The profile ID in social media is the handle, username or unique ID connected to an account. This looks different depending on the network. The username of a Facebook profile for instance is in the URL (e.g. facebook.com/max.mustermann). Profiles have a unique ID assigned to them (e.g. a string of numbers) that does not change. The SNH collects all IDs that belong to a user and identifies the unique ID. It thus can recognize a profile by its unique ID even if the username has changed.
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