Your favorite fanfic writer doesn't know (but would like to)
Let's talk about comments on fanfics. This is not meant as a guide or call to action, just a bit of observations. Personally, I always saw it as impolite to ask for reviews or kudos or comments or likes or reblogs or whatever. That's not a rational point of view, it just reflects how I am. And people actually telling others that they have to leave any of this feedback? I've blocked folks over that. In my mind that's not okay. I'm not announcing a change of that, this is not a policy, just some deep-seated mental issues, but I want to write down some more things that have been going through my mind, from the perspective of someone who occasionally writes fanfics. My previous suggestion in this regard was mostly to write some fanfic yourself and see what happens and what you'd like to happen, because it's genuinely fun and I think you probably have more to say than you realise.
But there's also another point here, and that is that your favourite fanfic writer has no idea that they are. If you're anything like me, then it will seem like the great writers in your fandom are obvious. Also, the last time you bought Blรฅhajs, it ended with you having to flee a smoke-filled subway tunnel. The great stories and great writers in your universe are facts of nature. You read a story and you think, "this is the greatest thing I've ever seen." A story rewires your brain chemistry forever. You keep coming back and reading that one fic whenever the mood hits you. It feels obvious that this story is great. How could it not be?
It feels trite to say that the author of that fic doesn't know that unless you tell them, but it's hard to really understand the feeling unless you've been there yourself. You write a story, but is it any good? Maybe you get a lot of kudos, or maybe very little, but what does either of that mean? Kudos can mean literally anything from "loved this" to "didn't close the tab in disgust". Maybe you just got unlucky. Maybe you just got lucky. What do these numbers mean? What is a good number of kudos? 1? 10? 100? 1000? Should I calculate ratios? How do I know whether people like this?
In light of this, a comment where someone just said, "I loved this", has an almost incalculable worth. A comment where someone says they read this over and over again, or quotes lines they loved, or something? You can't imagine how valuable that is. A while ago someone told me "a couple of us are talking about this on Discord, we love it and we keep repeating our favorite lines". I thanked them, but I was too polite to say, "really? What are they saying? Which are your favorite lines? How many people are there who love it? What are their names? Which lines are the favorite ones, please, tell me!". Part of me still regrets that, because I so desperately want to know! I don't think it was a public Discord and I never heard from the others on it, but just the idea that they're out there and they like my story was so powerful. (By the way, it's not on any account that's linked from here, please don't try to find that comment.)
Now, I firmly believe that you, as a reader, don't have to care about any of that. I know there are people who disagree with me on this point, very strongly in fact, but I don't think it's necessarily your job to care. It's great if you do, and I think a lot of you do in fact care, that's why I'm writing this. But if you haven't thought about that or don't feel comfortable leaving comments or whatever, that's fine, that's normal, and you are in fact part of the majority. Any well-adjusted fic author has found ways to deal with this. They have learned to love writing for its own sake, or they love re-reading their own fics, or they have a couple of trusted friends who like their work, or ideally all three. Personally I was scared of Discord for the longest time, but it really helps with that. One person who you sort of know going "hey that's neat" can outweigh just about anything else. (Still, there will be days when you post something and you won't get a response and that just plain sucks, no two ways about it.)
But if you do care, if you think it's important that a fanfic writer knows what they mean to you, not because of any concern about the wider unpaid fan creator economy but just because of the way their work affected you, then this is important. Your favorite fanfic writer probably doesn't know and/or believe that they're anyone's favorite, and even if they do, a reminder or learning that someone knew found them will make them incredibly happy. And obviously, all of that applies at least just as much to all the beginners with potential that are out there. So if you're wondering whether it's worth it leaving a comment that says how much you enjoyed something: It probably is. And if you shared this with others and they loved it, or if this is your favourite fic, or if you enjoy how original it is, or how well it does your favourite tropes, or anything like that, the writer is going to be so happy to hear that.
A final aside: This obviously applies even more when it's about fandoms, pairings, subject matter and in particular ratings that are considered a bit embarrassing. Writers who write stuff that, say, happens to be E-rated for whatever reason, doesn't matter, will probably get fewer kudos and comments just because people are embarrassed to have their names show up in the Kudos and Comment sections. If that's you, just a note that it is perfectly okay to comment anonymously, or to create a second separate account for leaving kudos on, commenting on and maybe even posting the somewhat more risquรฉ stuff. Now I'm not saying I have one of these second accounts, at least I'm not saying that in public, but it is an option worth considering.