on their Terms of Service they state:
"14. Security and Password
You are solely responsible for maintaining the confidentiality of your password and account and for any and all statements made and acts or omissions that occur through the use of your password and account. Therefore, you must take steps to ensure that others do not gain access to your password and account. Our personnel will never ask you for your password. You may not transfer or share your account with anyone, and we reserve the right to immediately terminate your account if you do transfer or share your account. You agree to immediately notify us of any unauthorized use of your password or account or any other breach of security. We are not responsible or liable for any loss or damage arising from your failure to comply with this provision."