social standards refers to web standards that have a social component, that is, for people (e.g. h-card), relationships between people (e.g. XFN), content published by people meant to be read (e.g. h-entry) & replied to such (e.g. rel-in-reply-to), and notifications thereof (e.g. webmention).
Mark up instances and references to people using the h-card microformat.
Markup links to people from pages about other people using XFN rel values.
When publishing a reply, implementations should also send a webmention to the original post.