I just came across that WordPress.com has adopted OpenID, an open, decentralized distributed identity platform. This is an attempt to served as a single sign-in standard on the Web for their users. WordPress.com is not the only blogging platform that announced to support OpenID, the other player LiveJournal has previously made announcement. Moreover, some of the big names are backing the support for OpenID including AOL (read this post), Microsoft, Yahoo!, and Wikipedia.

The main reason for WordPress.com to adopt OpenID is to ease their users by signing in a number of sites with their existing WordPress.com accounts, according to their official blog post.