Lately we had a lot of hacking attempts on our users' accounts. We don't know who is responsible for hacking just yet, but we can assure you that it is not coming from our site. In order to protect your account use a strong password that consists of letters, numbers and special characters. Please use a different password for each site.
Here at PTN we have advance security options. Go to your Profile -> Security, there you can choose a different login name. This means that you can login with a different username as opposed to the one you are using now.

Make sure you use a strong password.

very bad news, now I change my password