WhatsApp's new privacy policy has been deferred till May. (file) New Delhi: The Delhi High Court on Monday said accepting the new privacy policy of social messaging app WhatsApp was a "voluntary" thing and one can choose not to use or join that platform if one did not agree with its terms and conditions. "It is a private app. Don't join it. It is a voluntary thing, don't accept it. Use some other app," Justice Sanjeev Sachdeva said to the petitioner, a lawyer, who has challenged WhatsApp's new privacy policy which was slated to come into effect in February but has been deferred till May.