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1.
It's a nicer way of saying ''I don't care''
Example 1 :
Sasha : I Have This New Amazzingg Boyfriend
Emily: Nice To Know.

Example 2:

Elli: Today Is A Great Day For Me, I'm Having The Best Luck I've Ever Had
Brandy: Nice To Know.

Example 3 & Last One :

Jordan: I Love Her SOO Much.
Caitlyn: Nice To Know. I Wish You Guys The Best.
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by Kayla Crowder August 20, 2013