I think the jostling is fine; it wasn't that distracting for me. I like it as a reaction to being startled quite a bit. Since we rarely see MC's face, it works really well to show that surprise.
I prefer Tumblr personally. I like Discord, but in active communities, there's a lot of off topic discussion that can be hard to sort through if you're just looking for information. It can be really useful in building a community around the game though.
Based on what I've seen from interactive fiction development blogs on Tumblr though, be prepared for a rash of Thirsty asks, lol.