Sometimes You Can't Share

Riddle: If you have it, you want to share it. If you share it, you don't have it. What is it?

Answer: A secret.

Source: https://www.riddles.com/445

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Riddle: If you have it, you want to share it. If you share it, you don't have it. What is it? Answer: A secret. — by Anonymous v1.

Riddle: If you have it, you want to share it. If you share it, you don't have it. What is it? Answer: A secret. — by Anonymous v2.