4 Friendicas DFRN Protocol
7 * [Document with the DFRN specification](spec/dfrn2.pdf)
8 * [Schema of the contact request process](spec/dfrn2_contact_request.png)
9 * [Schema of the contact request confirmation](spec/dfrn2_contact_confirmation.png)
10 * [Description of the message flow](help/Message-Flow)
15 Friendica is using ActivityStreams in version 1.0 for its activities and object types.
16 Additional types are used for non standard activities.
18 * [Link to the specification](http://activitystrea.ms/head/activity-schema.html)
19 * [List of used ActivityStreams verbs and object types.](https://github.com/friendica/friendica/wiki/ActivityStreams)
24 Salmon is used as a message exchange protocol for replies and mentions.
26 * [Link to the protocol summary](http://www.salmon-protocol.org/salmon-protocol-summary)
31 Portable Contacts is used for friends lists.
33 * [Link to the specification](https://web.archive.org/web/20160426223008/http://portablecontacts.net/draft-spec.html) (Link to archive.org)
38 pubsubhubbub is used for OStatus.
40 * [Link to the specification](https://pubsubhubbub.github.io/PubSubHubbub/pubsubhubbub-core-0.4.html)