|Synonyms:||Kindle, Nook, Ebook reader|
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E-readers have grown in popularity in fandom as a means of reading fanfiction in offline settings. The word has multiple spelling formats: eReader and ereader being the most commonly used.Wikipedia defines an E-reader as follows:
"An e-book reader, also called an e-book device or e-reader, is a mobile electronic device that is designed primarily for the purpose of reading digital e-books and periodicals. Any device that can display text on a screen may act as an e-book reader, but specialised e-book reader designs may optimise portability, readability (especially in bright sun), and battery life for this purpose. A single e-book reader is capable of holding the digital equivalent of many printed texts with no added mass or bulk."
Fandom communities such as Kindledfans have sprung up to recommend or discuss the best e-reader devices along with how to format fan fiction for e-readers and how to manage e-reader libraries with software such a Calibre. Fan conventions such as Escapade began offering panels on e-readers and fan fiction and archives such as the Ebook Library and AO3 have begun offering fan fiction in e-reader formats such as epub and .mobi. Popular fandom e-readers include Kindle and Nook.A fan in very early 1999 was downright giddy at the thought of portability and fanworks:
Portability -- now that's an interesting subject. When I went on Christmas vacation a couple of weeks ago, I could have easily spent 20 bucks and bought 3 or 4 books for the plane. But what did I do? I spent 20 bucks to get a new ink cartridge and printed out Iolokus. *vbg*.HOWEVER! And everyone watch your nearest CompUSA! I recently heard of a new invention that's going to hit the stores soon...it's called an "e-book" where you can download up to 5MB of text from anywhere on the Web (Gutenberg Project, fic sites, etc) and TAKE IT WITH YOU in a little Palm-pilot sized gadget. My fanficker incarnation is definitely savin' up to buy one! tee hee... 
When did fandom first start using e-readers in greater numbers?
When did archives begin offering fanfic in e-reader formats?
Ebook Library started in 2006
Examples of use
Should I finish Underwater Light? I’ve read half of it, months ago. I had to stop because OH GOD IT HURT, IT HURT. I would read a couple pages, put the ereader down, sob, then pick it back up again. 
I‘ve had difficulty adapting to reading fan fiction on the internet. I have worked with technology for twenty years and quite comfortable with computers for a wide range of purposes for work and entertainment. Reading for long periods of time from a computer screen has been something I have never done well. It is too easy to be distracted, or become uncomfortable sitting still and reading a screen for long periods of time and have a sense of being lost in a vast collection of web pages. It is too easy to start to read something, enjoy the story being told and then be distracted by something else -- an email perhaps, the call of real life, and never find my way back. Then I started traveling more for business and my husband gave me a Kindle for my birthday. Suddenly, all those vast hours waiting in terminals or in airplanes had greater entertainment potential. I pulled up the many, many web page bookmarks for stories I have always thought I would read one day but never got around to it. I saved many of those stories to my Kindle which helpfully allows me to read as many stories as I want at once, maintaining bookmarks of where I left off - allowing me to be switch between stories with ease.