#1
How do you have close friends on UG, to complete some more of my profile?
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Quote by Doveri
Well a human can't sing an Em since that's a chord

If you mean Eb3/E3, then that is a contralto voice.
#3
Go to My Profile, click My Friends on the left, click the Edit Friends tab and then just click the friends you want to make close friends and click the Make a close friend button at the bottom.

^ and actually, Sam, yes it does. Having 5 does. But no one really cares about it that much.
Voted UG User of the Year 2015 & 2016