Nolan"The story of Signal" by David J. Lumb https://increment.com/security/story-of-signal/
Interesting history. Signal is still a great app.
Jonkman Microblog is a social network, courtesy of SOBAC Microcomputer Services. It runs on GNU social, version 1.2.0-beta5, available under the GNU Affero General Public License.
All Jonkman Microblog content and data are available under the Creative Commons Attribution 3.0 license.