The Riddler's Book

Riddle 25

Riddle me this

I'm often seen around a lot, referred to many ways,

See me black and you may find misfortune haunts your days.

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Tell a thing, that should have been kept quiet, to all around,

Then look inside the sack, there I'm no longer to be found.

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Nosiness, prying, snooping, leaves me fearing, full of dread,

For all these things are likely to see me soon lying dead.

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These clues combined should start to give a picture, an idea,

Of who or what I am, so can you tell me? Is it clear?