Matthias Pfefferle@cdevroe @colin what do you mean by "a few"?
mastodon does not support importing of old posts and the plugin does not send posts that where posted before the first person followed your blog.
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.