While I think it would be feature creep to get all this advanced video, audio, playlist stuff into Mastodon, I believe an ActivityPub-based YouTube could very smoothly interact with Mastodon (not directly integrate, I thing - again, Mastodon doesn't want to load big files from remote servers - but you could treat uploaded videos as toots where you simply have to click through to the original site to watch it, or something, and replies to that toot would register as comments)
A YouTube-esque service based on ActivityPub would share with Mastodon the follower (subscriber)-based content aggregation model, but instead of federating Article/Note-type objects it would operate directly on Video/Image/Audio objects. (Comments could be Note-objects). I believe it would also not do the local media caching thing that Mastodon does, you'd simply go in on the assumption of loading content from remote servers, I think, since videos are thicc af. Or maybe you'd use IPFS.
つながってないけど、つながってる。
芳賀書店から考える、マストドンとメディアの未来|加藤貞顕|note(ノート) https://note.mu/sadaaki/n/n74b1b47de54d
There's still a ton of "Hello world"'s on Mastadon to determine if any of this is going to be relevant.
I'm waiting for a security focus instance to really become useful (or as useful as possible). There are like 3 security instances right now and all of their local timelines are filled with vast nothingness.
Mastodon作者のオイゲン・ロッコさんが今自身のTwitterでトップ投稿にしているのは、日本のMastodon解説ツイート。日本語わからないけど絵が可愛いって言ってくれてる。 #Mastodonマメ知識
https://twitter.com/sameanko/status/853118806994034688
マストドン(mastodon)が流行りなのでついでに見た目変えようぜ - Qiita
http://qiita.com/Y_aQ00/items/2cf4152ec4af1cba51ce
こちらのマストドンのTootを翻訳できるようにするGraceMonky拡張、最初は動かなかったけどしばらくしたら動くようになった。インスコしたらマストドンの管理画面で言語設定できて、トゥートの下にある...から翻訳できます。便利! https://github.com/tomouchuu/mastodon-translate
さくら、対応早い。
スタートアップスクリプト「Mastodon」をリリースしました | さくらのクラウドニュース
http://cloud-news.sakura.ad.jp/2017/04/18/mastodon-startup-script-release/