Every visitor of WordPress.com blogs will now be able to sign in with Facebook or Twitter accounts in order to leave comments. This is in addition to being able to comment anonymously (as a "Guest") or as a WordPress user, ReadWriteWeb reported.

The new feature is intended to give users the flexibility to decide which identity they want to utilize for comments, even if they're logged in to WordPress via multiple accounts. For example, user can be logged in via Facebook or WordPress but decide to leave comments under Twitter profile.

WordPress describes the process as something that "gives visitors control over which identity they can use." And no doubt questions over identity and anonymity (and online etiquette) continually plague blog comments - for both blog authors and for blog visitors.