I barely use them myself, mostly because I'm too lazy to switch sites on my phone. I would be using the Steepshot app more often for my alt account, but the app won't work properly.
I just checked the uprising tag, and of the 4 latest posts, there were 3 made through Parley. I hope this won't become a new trend, because if I want to read the newspapers, I will go to the news sites. If people would at least edit the standard Parley-text underneath the image, so there would be still something personal about the post...
It definitely got my attention, and I will follow up on it. Just curious to see where it goes...