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To reinforce the points made here, I have some Software that allows Users to individually or simultaneously made rich Posts to Facebook, Twitter, and LinkedIn. I'd love to add Google+ to this list, but they don't even have something equivalent to Facebook's "http://www.facebook.com/sharer.php" which allows 3rd Party SW to enable the User to more easily Post when triggered from outside the Facebook Site... I'm not looking for an API where my SW has to ask for permission and court distrust (even that would be nice too), but rather something as simple as allowing a User who's already authenticated to Post.
Now something good about Google APIs... I find that the Chrome Extension and App API is both simple enough yet powerful enough and also solves many of the dirty problems like cross-domain service calls to be a suitable base for the still ill-defined Chrome OS. If you haven't tried out writing an extension yet, you should... It's so much cleaner and powerful than the Microsoft IE Extension Architecture which, by the way, is one of the most poorly documented areas of Microsoft's vast platform..
3 years ago on Google Engineer: "Google+ is a Prime Example of Our Complete Failure to Understand Platforms"
If the "Stars" don't easily connect with each other, all the work to do that is left up to the User... Say I'm reading a Document with a Link in it and realize I wan't to select some Text and Post the Link to Google+. I can write software that allows Users to post to Twitter or Facebook with a couple of simple clicks. With Google+ (with no Post API), the User has to be really motivated... That's what he's talking about and it'll hurt Google no matter how they want to blink us with more "Stars"...