* Follow a user, mutual following is friending.
* User-to-User Messaging
* Profile Comments
* User Blogs with Comments
* Photo Gallery with Captions
* Site Search for Friends
* Profile Bio and Information
* User Dashboard (Recent Activity of Friends)
* Emailed Activity
* Flickr Integration
* YouTube Integration

"Simplicity, Interface, Aggregation, Participation, Selfishness, Scores, Leaderboards, Explicit vs. implicit feedback, Voting, Wiser together than we would be alone" - great recap and perspective on communities.

The Designing Social Interfaces patterns wiki is a companion site to the book that Christian Crumlish and Erin Malone are currently writing for O'Reilly Media.

We decided to share the patterns as we write the patterns and the book to get community feedback. We think that hearing a variety of opinions about these topics will make the material stronger and more representative of what's happening in social interfaces. As we complete sections of the book, we will be adding the patterns.

Presented at Graphing Social in San Diego, March 3, 2008 by Chris Messina

makes a distinction I have not come across before between object-centred social nets (Flickr, Delicious, Digg etc.) and ego-centred social nets (Myspace, Facebook, etc.)

I have been saying it for a while, email is the first social internet identity for most people...

XFN Graph is a tool for visualising the relationships between website authors, primarily bloggers who mark up their blogrolls with XFN markup.