glitteringeva:

If you ever doubt whether you should leave a comment on a fanfiction you loved or not, please keep in mind that the only reason why I wrote and published 170k words of fanfiction over the last year is that every time I posted something, every time I updated a fanfiction, someone left a comment on it. Those comments included things like just a simple “Loved it!”, people writing down everything that has happend in caps, people yelling at my characters, and all sorts of thoughts people had after reading my stories. All of those comments are valid and great and I appreciated the hell out of every single one of them.

So yes, you should definitely leave a comment, because they will make the writer’s day and more comments = more of the content you loved.