I've noticed posting single photos is becoming much more popular - it went from 'posting 50 photos of the party last night' to 'here's a photo of what I'm doing now'. I'd say it's a result of people simultaneously getting phones which work as reasonable cameras, and better data signals which allow instant sharing - you're not sharing lots of photos after the fact (once you copy photos from your camera to your PC), you're sharing a photo as it happens.
This is a significant feature of Instagram also - because every single photo is a new story, you only share one photo at a time - Instagram is built on sharing your best photos, rather than all the photos from an event.
This is a significant feature of Instagram also - because every single photo is a new story, you only share one photo at a time - Instagram is built on sharing your best photos, rather than all the photos from an event.