In case you're wondering why Twitter embeds aren't working, it's some issue on their side.
I don't know if they've done away with external embedding (this was talked about earlier in the year, but never happened), or if it's just a bug on a Friday night when there's no one around to fix it.
If this doesn't resolve itself within a day or so, I'll try one of those alternative ways to embed tweets (which will require some work, so I'm avoiding it for right now).