email verification,legal,security

I would like to hear some opinions, experiences or advices about the following option:

I’ve always thought that such verification processes adds a bit more of security/legal protection for the owner of the service. For example if there is a legal issue with a blog (ex. Child pornography), isn’t it a useful information to know at least an e-mail account that has been registered by the author? And what would happen if someone makes a blog using the e-mail address of someone else?