A graph showing the distribution of the shares by software, #Mastodon clearly in the lead, #Bluesky a distand second, then #Friendica, #Hubzilla, #Misskey and many more.. All together 13 different platforms are represented.
https://social.heise.de/system/media_attachments/files/113/822/723/967/429/404/original/c7fe1352e149927e.png