Also depends on the kind of a secret.
If someone would tell you they're planing a birthday surprise for your friend (and might even need your help to do it) you'd be a real jerk to spoil it by telling about it, spoiling the surprise.
On the other hand if you overhear terrorists (watch out, now that this word is used we're being monitored by the NSA) talking about blowing something up you really should tell the authorities (even if it's supposed to be a secret).
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