LegallysocialBluesky has the best design. Mastodon has the interesting subject matter experts. Threads has a lot of people who like to argue with each other. Twitter has the most functional experience (still) but has been abandoned by at least 1/3 of its most interesting voices and is now an echo chamber.
GNU social JP is a social network, courtesy of GNU social JP管理人. It runs on GNU social, version 2.0.2-dev, available under the GNU Affero General Public License.
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