How come when we see poll's that are taken they never say who took the poll or who answered it?

I think that makes all the difference when it comes to trusting poll figures. Sould we disregard all poll's because it's really misinformation until someone comes forward with where they got their information to make their percentages. Agree? How do you know the truth?
How come when we see poll's that are taken they never say who took the poll or who answered it?
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