Stuart Langridge@avlcharlie Firefox is based on Mozilla's engine, Gecko. Safari and Epiphany are based on WebKit, and every browser on iOS is required to be a Safari webview. Most other browsers (except on iOS) these days are based on Blink, Chrome's engine, which started as a fork of WebKit but has evolved differently. (As you note, Opera was based on Presto, Opera's engine, a long time ago, but is now Chromium.)
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.