The default configuration syncs up to 3 connections away (friends of friends of friends). So you'd be able to find lots of interesting content and discussions in the extended network. In Patchwork (the most popular client), just go to the menu item labeled "Extended Network".

Also, you could join as many "pubs" as you like - based on your interests. You'll start receiving feeds from other people who share the pub, and their friends as well.

Make new ones! But really though, this is the first social network where I've been able to deeply connect with complete strangers. Some of my friends are on there too, but the sense of community is strong and contagious.

Not to worry, it's a social network. They'll pretend to be interesting.

You seek to add those non-friends who aren't. :-)