The Humanitarian Open Street Map work publishing infrastructure is a clear benefit.
But it is unethical to add locations to social media messages and publish them to a map. It exposes the creator of the message to increased danger in a way that they cannot control: they can delete their social media message, but not the copy on the map that they may not be aware of. This is why Twitter and other organizations forbid adding locations and republishing messages.
This is also why crisis-affected communities oppose it. For the example you give, the Haitians opposed the decision by students at Tufts to publish messages on a public map.
The 'micromappers' and similar organizations were kicked out of the mainstream crowdsourcing community for continued unethical practices that have done more harm than good. Please don't encourage people to continually violate the privacy and safety of the world's most at-risk individuals.
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