Jack Dorsey, now the CEO of Block (formerly known as Square), is @jack on Twitter, which he co-founded. But over the last several months he’s abandoned Twitter in favor of two newer social-media platforms: Bluesky, which he co-founded; and Nostr, in which he has invested, using Bitcoin. According to a New York Times article published on May 3, since Dorsey joined Nostr in December 2022 he has been publishing there an average of 59 times a day, “including messages that take aim at Twitter and [Twitter CEO Elon] Musk.” (Gift link.)
The Bluesky name seems like a straightforward scion of Twitter: a real word suggestive of Twitter’s blue bird. “Blue sky” is also a metaphor for “unconstrained optimism or imagination,” as the Merriam-Webster definition puts it.
The Nostr name is less lofty and less transparent.
Nostr’s modest proposal: “A decentralized social network with a chance of working.”