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What should I do when I see a spam post on MO?

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Bounty from Community

Enabling arXiv trackbacks for [other] SE communities

Unregistered Users (in Theory and in Practice)

Why I cannot start bounty on my own question, just because I have answered it?

Stack-exchange devoted to research problems, the suggested approaches and updates

Main site changed look, but only in one device

Are we making it too tempting/easy to send inappropriate posts to MSE?

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Tag for “open problems database” and other ideas for collecting open problems their approaches and updates

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My question was closed on MO because it is not research level. Where should I ask instead?

Is there a consensus on whether history of mathematics questions are acceptable on MO?

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