Johann150@Jain@blob.cat as they are talking about it being integrated in specific Mastodon clients I assume it's a separate Mastodon API server thing?
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.
All GNU social JP content and data are available under the Creative Commons Attribution 3.0 license.