The interesting thing I've considered about the architecture of the Google+ share feature is that it appeals to the ego to encourage the continual generation of high-quality, unique content. Because the original poster is given credit despite how many circles the share extends to, the design is such that if the content is favorable enough, there remains the possibility of shooting to internet stardom.

For example, if this post is well-liked, it could potentially be viewed exponentially throughout Google+ as more and more users click the "share" button. My name- and a link to my profile- is always attached to the post, so it could lead to a high degree of exposure and internet street-cred, if you will.

Essentially- if you would like to look at it this way- every posts holds the potential to feed the user's ego. The more interesting, unique things you post, the more likely it is that the share button will be pressed, and thus the more likely you are to get your name out to a greater number of users. This will likely lead to more users adding you to their circle(s) and telling you how awesome you are for posting such cool content. You are now internet famous!

Note that this does not apply to sharing content originally posted by other users, hence the emphasis on unique content. For example, if I share an awesome link that +Tom Anderson dug up, my own circle may give me a pat on the back for posting something neat, but as soon as the "shares" extend beyond my circle, I lose the credit, whereas the nod to +Tom Anderson remains.

Whether this was intentional by Google or not, it's very clever. It means that users have a constant incentive to churn out new, engaging content if they want to get noticed. This keeps the streams fresh and entices users to come back to the site, both to post the latest cool thing they found and to check their stream for what others have discovered.

Well played, Google+. Well played.

ETA: I didn't mean to imply that this is entirely novel, so much as highlight that it's a departure from other high-profile social-networking sites (e.g. Facebook, Myspace).
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