Bluesky is a corporate hedge to delay the social network business from becoming not a business, it is headed by variously naive or disengenous tech people who believe they are creating the future when they are mercenaries for the past.

You know when you see oil company commercials and they have lots of footage of wind turbines, solar panels and other ecofriendly crap? That is bluesky.

Misskey and Mastodon are two different types of open-source software for running a social media microblogging website that can interact with each other through the ActivityPub standard.

Bluesky is a similar but incompatible software run by a single company that was founded by ex-Twitter employees and is funded by billionaires and cryptocurrency scammers.

Mastodon is your coworker who’s honestly well-meaning and kind, but seems to have fits of upset for seemingly no reason at all and random beefs and drama with people that arise from nothing at all. She’s not very good at her job, but she can get it done, and she seems like a sincerely good person, which is enough that people like her.

Misskey is the employee who’s incredibly efficient, but has her own system that no one else can make sense of or follow. You have to just let her do things the way she wants to do them, but it all works. She does not hang around with anyone, just comes in and does her thing.

Bluesky is the guy who is always talking buddy-buddy while either wasting time or asking people for things, blows coke in the bathroom, is constantly hyping himself up. He seems to be very qualified, but it’s hard to tell how much of that is an act, and he’s also clearly a huge piece of shit. For some reason he is wildly popular with everyone.

You didn’t ask, but Bonfire is the IT guy who seems to live in his windowless office, wears T-shirts to work, speaks to no one, and is personally responsible for about 40% of the company’s products and services. Most people have no idea who he is.

Adding random information regarding Misskey. Misskey is specifically created to tackle Japanese internet culture and its own interpretation of fediverse.

For example, Misskey software allow the instance owner to run ads (usually community ads like promoting indie games, open for art illustration, or vtuber) while Western-made fediverse software are anti-ads.

Misskey also allows a lot of fun feature like social games, blogs, groups, emoji reaction, Misskey-flavored Markdown (people are getting wild with it).

It also have drive, which allow user to reuse existing uploaded image without using additional server storage.

Also, fun achievements!

https://itsfoss.com/bluesky-vs-mastodon/ This is a comparison about Mastodon vs Bluesky.

Misskey is most similar to Mastodon. Bluesky is also a bit similar to both but still the most different one from the other two. All three are different social networks. Mastodon and Misskey are ActivityPub compatible, meaning they can "speak with" other ActivityPub compatible social networks, e.g. Lemmy, Pixelfed or PeerTube. Together, that's what's called the Fediverse (different federated social networks being able to talk to each other). Bluesky is based on a similar, but different protocol called AT Protocol. It also means it's possible for social network services using this protocol to be compatible to each other. But not sure if it's there in practice yet, if there are even other social networks using this, and so on.

I'd recommend using Mastodon, and in general ActivityPub compatible social network services. They're all open source, anyone can host a server (which is very important, because if the server operator ever does any bullsh!t you're not forced to stay there and still can remain on the social network, just from a different node), they're federated (servers can talk to each other and usually do unless some specific servers are blocked on purpose by the other server), and they're compatible with multiple services also using the same protocol. And there are "big" networks already existing using ActivityPub, most notably Mastodon and Lemmy of course. Also, Meta's Threads is also using ActivityPub, however some Mastodon instance hosts have decided to block Meta's servers (there are good reasons for doing so but explaining this would make this post even longer).

Bluesky is controlled by a company made by ex-Twitter employees, I think its federation capabilities are still limited right now(?), and one can't be so sure how its future is going to look like under these circumstances. We've all seen what happened to Twitter after Musk bought it, so I think only the true, unrestricted open source social network platforms like Mastodon, Lemmy, Pixelfed, Loops.video, PeerTube and so on are the future.

Now that's a very openly worded question. I could even answer "their logos" lol

Mastodon and miskey are interface's to the same open public protocol.

Bluesky is another, largely private, twitter like microblog. That can, but may never in a significant sense allow something close to what the fediverse does.