“Rm9sbG93ZXJz” almost precisely presaged the entire plot of all of the Black Mirror episodes combined, and was great fun (particularly the near-total lack of dialog). I thought the “My Struggle” bookends in Season 10 were quite good, but then Season 11 retconned the whole plot away.

Both of the Darin Morgan-penned episodes were good (The Lost Art of Forehead Sweat, despite some on-the-nose politics, excellently recontextualizes a show about about conspiracies in the age of social media; namely that "the truth" doesn't matter at all).