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#Bluesky is way bigger, but I can only see bridged accounts here. I think, it's the second biggest already.
https://bsky.app/profile/fingolas.bsky.social/post/3lco3g5ojak2m
After counting my followers on #Bluesky by hand (because I can't see the ones, that are not bridged), it jumped on second place. Almost 2 % of my followers here are from Bluesky.
Indeed - if somebody follows you from Bluesky but their profile is not bridged, your Mastodon instance has no way of knowing that they follow you as it is never communicated across protocols.
So for Bluesky specifically you might want to count manually to get an indication of your reach. Any other service should be fine as it is.
@mho
Edit: It is however worth noticing that a lot of followers on Bluesky appear to be spam bots or similar trash accounts. It's hard to measure genuine engagement.
@mho you made bluesky blue 
This is really cool - and a great reminder to Bluesky users that they should follow @ap.brid.gy - so that their posts can reach as far as both Mastodon and Threads! 
https://bsky.app/profile/ap.brid.gy
Thanks for sharing!
#FediMeta #FediverseMeta #CWFediMeta #CWFediverseMeta #Sharkey
@mho Welches Tool nutzt du dafür?