Google+ would like to satisfy these needs, but they're playing catch-up and actually proving that scratch is a poor place at which to start. Path might work with the big guys, but they don't add a significant value. So why bother with new networks?
With apps like Instagram and Hipstamatic, the un-authenticity is right out in the open. Even mundane objects look covetable once they've been filtered through "Nashville," "Toaster," "Earlybird" or "Lo-fi."