First of all, your tool does not work properly, there's not 560 Czech authors for sure. Not even 56.

1. Friendly bunch of totally random folks.
2. @phortun and @espoem, even though they usually don't publish in Czech nowadays.
3. A list of the #cesky users by @xlisto that - unlike your tools - works precisely: http://ceskysteem.chytrak.cz/steem.php - 23 unique authors within last week is the correct number. And a community curating bot cesky.kurator by @tazi. Plus @cesky bot, quite mysterious project by someone who didn't reveal his or her name.
4. No witnesses yet.
5. We sort of stick together.
6. Weekly photo-themes project run by @tazi, week topics picked by selected community member. Regarding the rules, people should write Czech while using the #cesky tag. Hence you should translate your post to Czech next time (multilingual posts are all right with us) or avoid using #cesky. Otherwise you may end up with flags.
7. We would appreciate more newcomers. Besides of that, we're having great time.
8. Beer. Well, it's not meal officially, but we call it the liquid bread and I am drinking a Christmas special now.