This page documents some of the details of how messages get from one person to another in the Friendica network.
There are multiple paths, using multiple protocols and message formats.
-Those attempting to understand these message flows should become familiar with (at the minimum) the [DFRN protocol document](https://github.com/friendica/friendica/blob/master/spec/dfrn2.pdf) and the message passing elements of the OStatus stack (salmon and Pubsubhubbub).
+Those attempting to understand these message flows should become familiar with (at the minimum) the [DFRN protocol document](https://github.com/friendica/friendica/blob/stable/spec/dfrn2.pdf) and the message passing elements of the OStatus stack (salmon and Pubsubhubbub).
Most message passing involves the file include/items.php, which has functions for several feed-related import/export activities.