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Answer for the clue ""Gossip Girl" signoff ", 4 letters:
xoxo

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Wikipedia Word definitions in Wikipedia
XOXO ( eXtensible Open XHTML Outlines ) is an XML microformat for outlines built on top of XHTML . Developed by several authors as an attempt to reuse XHTML building blocks instead of inventing unnecessary new XML elements/attributes, XOXO is based on existing ...