Experimentation is so commonplace on the Internet now that if you use a platform like Facebook you’re probably part of many experiments all the time.
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Quite often when we’re asking these difficult questions we’re asking about questions where we might not even know how to ask where the line is. But in other cases, when researchers work to advance public knowledge, even on uncontroversial topics, we can still find ourselves forbidden from doing the research or disseminating the research.