Today's insight:

All(*) websites and web applications are fundamentally social, i.e. applications that have more than one user.

Even if you have a site on which only you post or publish, you are expecting that sometimes some others read what you put there.

Granted, not the functionality that we usually think of when we think "social media" or "the social web", but social nevertheless.

*) 100% minus a negligible number, e.g. I have a Shaarli instance for bookmarks thats only accessible by me.