Just had a shower thought.
As Twitter now requires a login and Google is apparently de-listing most search results for Twitter, it technically qualifies as a dark web website, something the media and Hollywood love to throw around as a scary phrase.
(It seems users still show up in Google and also some tweets, I just wanted to hear your opinions)
I think it would be more of deep web than dark web. Dark web traditionally refers to TOR and onion services.
But yes, that would technically be a deep web website, as hilarious that is xD