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1.
A common symbol used by tweens and teen girls, recently on Facebook as the majority. It expresses nothing of dear concern or dear heart-felt emotions. It's simply two semi-colons and a heart.

Because it looks damn classy.

This is usually placed after a very pathetic subliminal message post- written in the hopes that a certain person will read it... and think more of it.

Because you used TWO semicolons.

And a heart.
Facebook status reads:

"&&i dont know if you love me too;; but forever i will be by your side no matter what happens because you are my angel darling baby boo;;♥"

See also: &&
by &&;;♥luvluv April 11, 2011