Upon the disclosure of privacy information, Spam emails would be sent. Spammers use plenty of email addresses to send tons of emails for profits.
Phishers might using the phishing link to allure the users to a fake website, so that the their private and sensitive information such as the bank account ID, passwords, as well as credit card number would be accessed.
With the fake registration in the social website, the third party could get your name, birthday, and other schooling information. Or some email addresses are available. Spammers and phishers can use the social network information and pretend to be those users’ friends to send spamming emails to users. Phishers can send forged link to users to obtain sensitive information.