Distributed social networks such as the fediverse, for microblogging based on the ActivityPub protocol, are decentralised networks, typically based on free and open-source software (FOSS) that aim at community moderation of content. In 2018, the fediverse was "a loose family of sites that promote unfettered interaction across servers or even services", intended to provide an alternative to the "walled gardens" of Big Tech social networks.[156]