What is YOUR definition of Social Software?

Wikipedia, the modern day oracle, says about social software that

In computing, social software encompasses a range of software systems that allow users to interact and share data. This computer-mediated communication has become very popular with social sites like MySpace and Facebook, media sites like Flickr and YouTube, and commercial sites like Amazon.com and eBay. Many of these applications share characteristics like open APIs, service oriented design, and the ability to upload data and media.

Personally I think that the wikipedia definition does not go far enough - it describes the element of "connections" between users, but does not include the element of "discovery", which IMHO is the "so what" that delivers the kicker without which social software (and social networking) would not have much value.

I guess I would state my definition as follows:

Social software refers to types of computer software which contain features or functions that recognize connections between users of the software system, and facilitate discovery of new content or actions (relevant to the context of the software) by leveraging the knowledge or actions of users one is connected to. In some cases, the software may also manage the mechanisms by which users connect to each other. Many of these applications share characteristics like open APIs, service oriented design, and the ability to upload data and media.

What do you think? How would you define social software?

(credit for image to Adam Mulligan)