There’s probably a better place to answer this, but regarding Tumblr: I’ve recently hit 1,000 followers between both my WIP blogs, so I think I can share some insight!
Having a Tumblr for your game is extremely time-consuming, particularly once it picks up steam and attracts lots of interest. For every ten questions I answer, there are ten more, so I’ve had a backlog of 300 questions stored up that I can’t quite make a dent in, because once I answer twenty, twenty more come in!
Answering ten questions (depending on their depth and detail) can take me anywhere from fifteen minutes to an hour (and that’s in between a full-time job, commuting, making dinner, cleaning, working out, and trying to find the time to write on a normal weekday). So to keep your Tumblr presence from hampering your productivity in other areas, you have to have a lot of discipline: you have to be okay with letting questions sit there or making fans wait, and you have to be strict about how much time you spend on there to get anything done. It can get a little gross when certain readers become demanding of your time on there, but by and large it’s easy to deal with and very rare: 99.99% of the people I’ve encountered on there have been incredibly patient, supportive, and encouraging, just like the community here!
So, while it is time-consuming, I find it really excellent in both gaining and interacting closely with a potential fanbase. More importantly, not only do the questions on Tumblr cause me to think of my game in new and interesting ways, they help me know my characters and world so much better than if interactions were limited simply to testers betaing a presented project. I hope that makes sense? I’ve gained so much inspiration and clarity from interacting with hundreds of people eager to know more about my story that I think it’s a beautiful trade-off for time spent (so long as you are disciplined). The questions posed and the free-form, off-the-cuff way of talking about my world/story/characters often propels creativity more for me than on here, whereas this is a more formal process to refine an offered game.
Also, people on Tumblr are more apt to share/reblog fan art, fanfiction, memes, inside jokes, relevant gifs, blogs and reviews, and etc., rather than posting them here in the relevant threads, so there’s that!
I totally get this, though. Sometimes I feel the same way and struggle to keep up with both WIP and Tumblr, but the struggle is 100% worth it for me. I’d recommend Tumblr to any writer only if that writer feels they have the time and energy to maintain it!