We've been using the Twitter API and social graph to help jump-start new users' fediverse social graph. debirdify, movetodon, fedifinder.
It's a vulnerable point for the fediverse, and having other ways to onboard people and help them find their friends' existing fediverse accounts is important.
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.