Using this method, we can even determine with a high degree of accuracy who wrote a given email, and infer the gender, nationality and education level of the author.

利用这种方法我们很好准确度的确定谁写了这封邮件，甚至可以推断(作者的)性别、国籍、受教育程度。

youdao

The site does not ask for one's nationality, and one only needs to be 13 or older and have a verified email address to create an account to initiate a petition or sign one.

NPR: Chinese Air Their Cases By Petitioning White House