Vivaldi, the free desktop browser founded by Opera co-founder Jon Stephenson von Tetzchner, announced that it has launched Vivaldi Social, its own Mastodon instance. Vivaldi Social has also been integrated into the sidebar of the desktop browser, creating an inbuilt Mastodon client for users. Founded in 2016 by German software developer Eugen Rochko, Mastodon is a decentralised ad-free social network that is run on many different servers or “instances” across the world. The platform’s popularity peaked recently after Elon Musk’s acquisition of Twitter. The federated decentralised nature of the social network means that it is a great fit for Vivaldi’s...