Self-published Authors, Twitter could turn into an immediately measurable revenue stream for you. Gumroad.com enables artists to upload their work and sell directly from their Twitter accounts via a Buy button. Traditionally-published scribes may be able to take advantage of this depending on their publisher. Hachette is experimenting with Twitter sales, piloting their partnership with Gumroad using a few authors with huge twitter followings. There’s no news yet about Hachette’s twitter sales performance (they announced the partnership December 10, 2014), but we’ll be monitoring this. Nice move forward for Hachette, by the way, after a bruising 2014 locked in battle with Amazon over ebook pricing.