In the rich text editor:
@Faceted
In a comment:
[Faceted](https://chowlings.com/user/Faceted)
For Names and Avatars:
In the rich text editor:
%Faceted
In a comment:
[![Faceted's Avatar](https://chowlings.com/images/avatars/default.jpg)](https://chowlings.com/user/Faceted) [Faceted](https://chowlings.com/user/Faceted)