Breadtube if it didn't suck.
Post videos you genuinely enjoy and want to share, duh. Celebrate the diversity of interests shared by chapochatters by posting a deep dive into Venetian kelp farming, I dunno. Also media criticism, bite-sized versions of left-wing theory, all the stuff you expected. But I am curious about that kelp farming thing now that you mentioned it.
Low effort / spam videos might be removed, especially weeb content.
There is a cytube that you can paste videos into and watch with whoever happens to be around. It's open submission unless there's something important to commandeer it with at the time.
A weekly watch party happens every Saturday (Sunday down under), with video nominations Saturday-Monday, voting Monday-Thursday. See the pin for whatever stage it's currently in.
Had a chuckle making fun of confederates watching this, but it's both a really fascinating historical moment and also kinda silly. First ever submarine kill... for the illegitimate slavery state... and they rekt themselves in the process. Lol
They had it in a big fish tank last time I went and saw it like a decade ago.
Truly a dunk tank 
This is actually how I found out it's at a museum/lab, despite knowing its story I somehow missed that they found it.
I found a YouTube link in your post. Here are links to the same video on alternative frontends that protect your privacy: