MicroID is a lightweight identity layer for the web, invented by Jeremie Miller (creator of Jabber). MicroID enables anyone to claim verifiable ownership over content hosted anywhere on the web (social networking sites, discussion forums, blogs, etc.). MicroID is not an authentication or single-sign-on service, just a straightforward method for identifying content ownership that complements existing technologies such as OpenID and microformats. The technology is radically simple and enables developers to build new and unique meta services with minimal effort. It’s already being used by the likes of ClaimID, Last.fm, Ma.gnolia, Wikitravel, and Yedda.