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Twinkles? (Brasilia)

I don't know where to ask this question so I'll start here. Please forgive if I've made a mistake; I am new to InterNations.

What is a Twinkle? I twinkled several people this morning and then it occurred to me that Twinkle could have connotations I didn't intend. Could someone explain what a Twinkle is? Also, is there somewhere more appropriate for finding this kind of info?