Bluesky started out at Twitter. Now it's a Twitter rival. CEO Jay Graber explains what happened.

Bluesky started out at Twitter. Now it's a Twitter rival. CEO Jay Graber explains what happened.

Bluesky CEO Jay Graber says she's building a service that will appeal to people who want to build their own social network — and those who just want a Twitter replacement.DON MACKINNON/AFP via Getty ImagesBluesky is a fast-growing Twitter rival, with 36 million users.But that's not really what Bluesky — which was actually hatched at Twitter — was supposed to be.This confuses a lot of people! I asked Bluesky CEO Jay Graber to explain her company'…