friendica_stable_2026.01/doc/en/spec/protocol/protocol.md
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# Used protocols
## Friendicas DFRN Protocol
* [Document with the DFRN specification](spec/dfrn2.pdf)
* [Schema of the contact request process](spec/dfrn2_contact_request.png)
* [Schema of the contact request confirmation](spec/dfrn2_contact_confirmation.png)
* [Description of the message flow](help/spec/message-flow)
## ActivityStreams
Friendica is using ActivityStreams in version 1.0 for its activities and object types.
Additional types are used for non standard activities.
* [Link to the specification](http://activitystrea.ms/head/activity-schema.html)
* [List of used ActivityStreams verbs and object types.](https://github.com/friendica/friendica/wiki/ActivityStreams)
## Portable Contacts
Portable Contacts is used for friends lists.
* [Link to the specification](https://web.archive.org/web/20160426223008/http://portablecontacts.net/draft-spec.html) (Link to archive.org)