OpenID is a single sign-in infrastructure that potentially alleviates the need to create new passwords and user names for every new site one joins or visits. There’s been lots of discussion about OpenID and who’s in, who’s almost in, and so on. Today, Yahoo formally joined (and fully legitimized) the effort. Microsoft Passport was originally conceived to be a similar system but failed to gain support and broad adoption.While it’s a great convenience for end users and intended to “open up” the process of signing in to sites, the strange paradox of OpenID is that it potentially reinforces a relationship between a user and his/her open ID “home.” That is, the master login that a person uses: AOL screenname, Wordpress login, or, now, Yahoo login. As Yahoo explains:
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