никак. надо пароль подбирать.
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это незаконно но можно: Обычно вводишь типо забыл пароль, и вводишь емайл человека. Далее нужно вести в майл ру (или другие соц. сети типо икс бокс) емайл человека потом в пароль ввести его имя и дату рождения; имя питомца (если знаешь) ; ну или чо нить другое.. . можно нажать опять в майле ЗАБЫл ПАРОЛЬ и позвонить/написать человеку, беспалевно начать разговор, и в конце спросить: например если в майле был вопрос ИМЯ ВАШЕГО ПИТОМЦА то нужно написать и сказать - А я забыла у тя дома какой питомец? ну я таким способом зашел на страницу одноклассника но не менял пароль. потом написал ему чт натролил))
Можно, но никто бесплатно этого делать не станет.