Or she/he just added you... Delete them if you don't know them / want them as friend?!
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If you were hacked, you wouldnt have access to your account.
Hackers dont generally do it to have more friends. Maybe you added someone and forgot to remove them?
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Prob this. If you send or receive a gifted game it adds the person to your friends.
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Did he gift you something or did you win something from him?
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http://steamcommunity.com/id/Yumi_Beast/friends/
Have a look there and it'll list the date you and them became friends. Maybe that'll jog your memory?
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I was looking through my list of friends and saw unknown nickname... I asked who he is and he brought up to names which I've never heard... Seems I was hacked... Or not?
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