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"Twinkle back" to "Twinkle"? (Brussels)

Hello everyone.

I am new here on InterNations.
I am not sure this topic is appropriate to this town talk section.
Recently I have received several twinkles.
After spending some time in Googling, I found out Twinkle means saying "Hello".

Question is how I do react?
"Twinkle back" is to say "Hello, there" or to reject it?

At first, I thought "Twinkle back" is for me to say "Hello" to the sender.
and I twinkled back to a couple of peoples to say "Hello".
And then, the sender whom I twinkled back disappeared in the list.
So, one question arose.
'Why the sender disappeared? Does "twinkle back" mean rejecting it?'