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Project Gutenberg - huge library of free ebooks
(www.gutenberg.org)
Pretty straightforward: books and literature of all stripes can be discussed here.
If you're interested in posting your own writing, formal or informal, check out the Writing community!
This community's icon was made by Aaron Schneider, under the CC-BY-NC-SA 4.0 license.
Occasionally do some proof-reading for them here, if I'm having an off day it makes me feel like I've at least done something useful lol - pgdp.net/
Edit: They also have some interesting books up - particularly dated nonfiction where you probably wouldn't want to read the entire thing but 5 pages is kinda cool.