Day 2: Your newest fandom.
On one of the previous memes I did, I wrote an essay on what the word "fandom" means to me in this context. (Looking at the rest of this meme, I see I'll have to differentiate between "fandom" as the subject matter and "fandom" as the community of fans.) The issue I have with the term is that just because I like show doesn't mean I'm a fan. For example, we're watching The Good Place right now (we're in S4) and loving it, but does that mean I'm a fan of the show? I would say no. Yes, we talk about it when we're not watching it, but that's mostly because we're still in the middle of it. I don't foresee that it'll last once we're done.
My definition of fandom means that the property becomes a part of my life somehow - we talk about it a lot, I write fanfic about it, I collect merch, etc. There's some nebulous threshold level, as I wouldn't count myself as a fan of Torchwood except as a DW-related property that I enjoyed, even though I would write fanfic about it if I got an idea.
Given that, my newest fandom would have to be Good Oemns. I had read the book long before seeing the series, but it's really the series that captivated me. Yes, it's a bit old as a fandom, but there hasn't been anything since.