Bluesky is growing....
Stats & Counter is here:
Is there any bridge planned 4 nostr <-> Bluesky ?
Discussion
nostr:npub1tyrpvy9cuakwdgcx4nq8nya97qegct74qgwa032xufg8lzkhvsaqgw2es9 works for posting if you use iOS. Not sure about two-way bridges. At least via Mastodon there should be ways to do it.