From there:
"Are you going to reveal the names sometime?
No. We will never reveal who sent messages on Honesty Box."
and
"What is Honesty Box?
Honesty Box lets you find out what your friends really think about you, your haircut, your body, your friends etc' by putting a box on your profile that people can use to send you anonymous messages."
I am absolutely 100% SURE that no one will know it is you, but you. Really.
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