Six Ways to Support Fan Fiction Authors – The Lallybroch Library
I would add that reblogging fics (if you read them on tumblr) is a great way to support fic writers. Oftentimes you’ll see that fics have far more likes than reblogs, and likes are great, but reblogs help spread someone’s work so more people can read it. If a work has 100 likes and 10 reblogs, that means only a tenth of the people that enjoyed the story thought it was worth sharing.
I second that. If you’re a new writer reblogs are the only way for anyone to see your work. Always reblog if you’re especially impressed by a work.