lamp@Jain @p @r000t @graf mastodon is a public publishing network and they have a clear warning not to "share sensitive information over mastodon" for a reason. dm to other servers and they can leak just as well. If this is an actual problem to you then it's all your fault, IMO. I do not think anything nefarious can be done with this, it's just fun.
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.