When I had my first smart phone, I did instagram just to crop and maybe do a simple filter for facebook. Now that I have a better camera on my new phone, I'd say I check my instagram about as much as I check my facebook. Plus now that I have followers that aren't just facebook friends, it makes it more fun.
I haven't tried PicsArt or Aviary yet, I'll have to check them out.
If anyone wants to follow me, my user name is @mikefrigginbaker