I have 4 Mastodon accounts, 1 on Vivaldi (as I use this browser), and 3 on Polish servers. My main one is on 101010.pl (largest Polish, can read formatted posts), other ones are on pol.social and mastodon.com.pl. I was also on calckey.pl, but Calckey appararently was not ready for use - the instance is now closing down. I have a Polish /kbin account (on karab.in), and WriteFreely and Mobilizon accounts.