Artists should use Instagram!
Here is why:
These apps literally offer thousands of variations of filters and effects for each individual image. Now, when you feel artistically uninspired, you can find an interesting photo on my phone or computer, and play with the many different filters until you find one that moves me. As a painter, these apps can help you to discover new techniques, and effects to use in oil paintings.
You can use Instagram as a helpful testing tool. Monitor the popularity of my uploaded photos of possible painting subject matter and composition and easily examine the popularity and statistics!