switching.social
Prismo is an open federated alternative to sites like Reddit or Hacker News.
It's still under development, but the first instance is online here:
It's been in closed beta for a while, but Prismo now has open sign-ups for the first time.
You can sign up at:
Chirp! is a social network. It runs on GNU social, version 2.0.1-beta0, available under the GNU Affero General Public License.
All Chirp! content and data are available under the Creative Commons Attribution 3.0 license.