By the time he was 14, he had co-written the specification for RSS -- originally Rich Site Summary, now Really Simple Syndication -- a Web-publishing technology for delivering syndicated content from frequently updated sites, such as blogs or news websites.

CNN: How Aaron Swartz helped build the Internet

Ninety-nine percent of Google's revenues come from ads, either the ones it puts next to free Internet-based services like search and e-mail, or through syndication on third-party Web pages.

FORBES: Google's Call

The syndication model of RSS extended as a metaphor through the Web and lives in the ubiquitous orange square (a graphical approach originally deployed in the Firefox browser) familiar to bloggers and podcasters everywhere.

FORBES: Open Data Activist Aaron Swartz Dies Aged 26: 'Uncompromising, Reckless and Delightful'

The term Web 2.0 describes the post-dot-com generation of sites and services that use the Web as a platform--things like Flickr, BitTorrent, tagging and RSS syndication.

FORBES: Magazine Article