Another good recommend for free reads are online places like fanfiction.net and AO3 aka Archive of Our Own.
Not everyone's taste, but if, like me, you enjoy reading fiction set in a particular universe e.g. Trek, Harry Potter or just about any other 'verse under the sun, then it's worth a furkle. As it's fanfic, it's all not-for-profit, but amongst some truly dreadful stuff, are some real gems that would hold a candle against professional authors. And sometimes better the premise by the original author.
Some people lurk, others give feedback on the stories, which can range from a drabble (100 words) to epic length (several hundred thousand words). And to be fair, there's worse ways of spending time online.