Two Fazed People

You are near me, when you see me
When my back turned, you are slapping it

You're friendly, to get to know me
When you know me, you are slapping it

One fazed, two fazed people
May afraid of you
Three fazed, four fazed people
I may scared of you

Old friend, new friend
You will never know which one to trust

If you can keep a secret, keep it in your mind
Never tell your brother or sister

[?]

You are near me, when you see me
When my back turned, you are slapping it

You're friendly, to get to know me
When you know me, you are slapping it

[?]

*Help!*