To make it as an independent author, you need to bust out of your own social circle and into the wider world. There are millions of readers for your books out there — you just need to get their attention. Advertising, especially on Amazon, is an excellent way to find your readers.
Amazon vs. Facebook
The only other site with the reach and effectiveness for advertising comparable to Amazon is Facebook. And though FB ads are useful (see the essential on Facebook ads), especially for direct sales and Kickstarter campaigns . . .
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