All you need is PHP and a MySQL database. Installation can be done via file upload, git or docker.
Decentralized architecture with no central authority or ownership. Relationships can be made across any compatible system, creating a network of Internet scale made up of smaller sites. Seamless wall-to-wall posts and remote comments, even across different network nodes.
Friendica has build in support for the ActivityPub (e.g. Hubzilla, Mastodon, Pleroma, Pixelfed, Socialhome), OStatus (e.g. GNU social) and diaspora* (e.g. diaspora*) protocol. With additional addons you can bridge to more networks like pump.io, Twitter and others.