[Fisneaky]

Chances are this person is someone you know ; as he/she's added your real name in the profile. A hacker could bruteforce the password , but they wouldn't find your real name on you-tube if you'd not entered it there.

Alternatively you could have a keylogger or other backdoor trojan on your rig.

Run the usual checks + Fsecure do a free online check. - see link below.

Change ALL your passwords (its a good idea to do this regularly).

http://www.techhail.com/software/4-free-...ur-pc/2630