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It is also an indirect identifier, which can be used to communicate with the individual and in some cases it may include information about his/her name (first name and/or surname). When identification is based on email:

• EI=0,25 (Negligible) when the email address does not reveal any other identification information (e.g. name) and is not used as a primary address of the individual in internet sites, forums or social networks.
• EI=0,75 (Significant) when the email address does not reveal any other identification information (e.g. name) but is used as a primary address of the individual in internet sites, forums or social networks (searchable on the web).
• EI=1 (Maximum) when the email address reveals the individual's name and is used as his/her primary address in internet sites, forums or social networks (searchable on the web).