Because of Android's intent system you can share it over literally any social vector installed on the phone.
Here's a screen shot of the sharing options shared via Dropbox.
It's a little faded because the screen shot button combo includes the back button on my phone... not the greatest design.
--does Android's Camera app have social sharing features?
--does it provide some kind of cloud-based sharing support?
I see the above, plus Instagram's 30M+ user base, as their main benefits.