Online marketplace Bonanzle added the ability for users to login or create an account through Google and Facebook. OpenID allows Internet users to use an existing account to sign in to multiple websites without needing to create new passwords - see more information on the Open ID website.

Users can choose to automatically login to Bonanzle from their Facebook or Google accounts. Could Facebook's "Like" buttons be next? This article from BusinessWeek explains Facebook's Open Graph protocol that lets websites add "like" buttons to features on their sites, and says Web pages that use the open graph plug-ins will show up in Facebook search results in the same way traditional Facebook pages do - an incentive for websites to "friend" Facebook.