There's always a way. To start, try to remember your username. View their records, the phone book: you might somewhere for the reliability of recorded login. You only need to remember exactly where.
If you have forgotten your login in the "Classmates", the problem can be solved in a few minutes. To get started, go to the main page and find the window where you specify the account. Below is a link that says "Forgot username or password?". Click on it and go to the next page.
Here you will need in the new window enter your e-mail address or mobile phone number that you specified during registration in the network. Without these data, to recover your username unlikely. Then type in a special window the security code and click "Continue". Within a few minutes, your email address or phone will receive a message with the code. You will need to enter in a special field on the new page.
After you collect the six-digit combination received in the message, click "Confirm" and go to the next page where you will be able to regain access to his page. After all operations performed in the top line of the window in the field "Login" will appear combination you used to log on to the website. Then in the next line, enter the current password and re-enter it again. Now click "Continue".
Go to the main page, enter the required information and press "Enter". If access to a computer only you have is to employ auto-save password. In this case, you do not have to constantly enter a username and password.
Unfortunately, to recover your username and other social networks is somewhat more complicated than in the "Classmates". But if you were tied to the page the phone, the situation is easy to fix.