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sirtelon Ask HN: On a 'contact us page', do you like e-mails or forms?

May I ask what is the aim of fill in an email address when one wants to leave a comment. For example, in this page: http://ux.stackexchange.com/questions/6959/contact-form-or-m..., at the bottom, you can post as a guest, but the email address is necessary.

sirtelon Ask HN: Purpose of email address in blogs' comment box?

(My name is green, oh I'm a green hand then) Sorry, my fault. I mean comment box in a blog. One must type email address before submitting. like this: http://wpthemetutorial.com/2013/05/02/working-with-vagrant-a...