@daniel @ruario Quite literally a private copy of all your included social network activities (Mastodon as a starting point).

This was not practically possible before because social networks were unstructured web sites, owned by companies that wanted to exclude outside services built on top of them. But when (more or less) built on open standards, a browser would know what it is dealing with.

So yes, ultimately Vivaldi as a Mastodon+ client, directly and/or via extension.