forrest(layperson undrstndng) for anyone remotely interested, mastodon instances gather data (replies, user profiles, hashtag stuff, likes/reshares, etc.) from accounts you follow, and then your instance "absorbs" that data so that it's visible for other users on your instance; this is why an su instance can be problematic: a multi-user instance has many vectors to gather data, an su instance does not; this leads to things like no replies on posts, blank/small local timeline, blank profiles, etc.
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.