What is Bluesky? &#xA; Bluesky is three things. &#xA; Bluesky the social app &#xA; Available on Apple&rsquo;s App Store , Google Play , and the web &#xA; Bluesky the atproto app &#xA; Operating within the app.bsky.* atproto namespace &#xA; Bluesky Social, PBC &#xA; The startup company originally funded by Twitter (later by investors) that created and supports atproto.