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My account was created then because that's when I found my first POW block, same goes for most of those others and their owners aside from those created by @register, which was a service meant to intake the non-mining-literate mostly from the BitShares crowd. This was before Steemit (the website) was even publicly announced and there were a handful of posts and comments, pretty much tests. Early days.

I guess those 6 accounts could be run by one puppetmaster who stays up 24/7, is able to present multiple personalities that talk to each other, and can fake different accents over voice chat. But the more likely explanation is they're individual people. It doesn't look like jesta has anything to do with the steempress account anymore either.

All of the early adopters of Steem created their accounts around the same time. That's when the blockchain was getting going.

Downvoted for more useless annoying tagging. FYI, you can mention account names to discuss them without turning them into tags.