Hello, i have witnesed this today when i logged my Battlelog account i saw a Russian server i have not played in my History. Then there were some people in my friendlist I don't know or added by me. I didn't tell my Serial Code to anybody and i dont share my account. If you can help me i would be glad. Thank you.
Sorry to hear that your account has been hacked.
Start by reading this to get your account back if you don't got access to it anymore: https://help.ea.com/article/i-think-somebody-hacked-my-origin-account-what-can-i-do-now. and http://answers.ea.com/t5/Battlefield-3/Account-Hacked-Compromised-and-Account-Security/td-p/1125370
If you do got access to it change your Origin password to something good ( https://strongpasswordgenerator.com/ ) that you don't use anywhere else and then do it again for the password to your email address.
Then read this to make sure it never happens again:
https://help.ea.com/article/how-to-maintain-account-security
Also, make sure to enable Login verification:
http://help.ea.com/en/article/origin-login-verification-information/
