It was a little over a month ago that Google introduced Google+ Sign-In. The basic idea being the same as it is with Facebook and Twitter: use one account to access all your sites. So, what makes this different from those other networks? Well, allegedly this will result in less social spam and a better integrated experience. Oh, and also, now that Mountain View has signed deals with Janrain and Gigya, the big red button should be just about everywhere on the internet.
Between the two companies, the client list is gargantuan. Everything from major television networks, ISPs, online publications, and consumer brands are represented.