Crowdsourced funding platforms allow you to raise investment from "the crowd", in order to invest in your book idea.
If enough people want to see your book published, you can ask them to invest in the idea to turn it into reality. Sites offering this facility are:
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Kickstarter (USA)
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Sponsume (UK & Europe)
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Peerbackers (Global)
As Alison Flood reported in the Guardian
HERE, Rich Burlew was able to use Kickstarter to raise $1m for his self published webcomic book,