Just caught this post from @aweissman. The app looks a bit more polished since I first saw it in May. It's also come up in a few conversations with other startup folks.

@ZackShapiro this is an interesting take on updating the forum format, building upon what actually works about forums.

Love that Amino is building a mobile network for niche interests. It's like having a Facebook JUST for stuff you actually care about: Doctor Who, Anime, Minecraft, K-Pop, video games, your pets. The target demographic is teenagers. They have over a million downloads for their apps. I'm interested in seeing which community they roll out next.

It's overall an interesting set of apps, but we will have to see how it plays out a bit more. I think they have some good ideas but I'm not sure how it's going to keep expanding.