1.Your comment too short, perhaps less than 5 words.
2.Your comment not know the writing, or there are at least 1 keyword with the same posting.
3.There are a link that included to comment.
4.If you're judged as a blocked visitor by the admin with the identification of the email, use another email.
5.IP you in the black list admin blog, but it's not a problem for users cafe.
So you must be careful when give a comment in Wordpress.
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