It is an app which you download where you can interact and get more of your work seen and find more people in the areas you are interested in. There are many groups and categories available. I signed up and then got very confused and haven't been brave enough to poke my head in there again yet. My poor ol brain is being stretched to capacity already and I'm inclined to stick to the easy stuff. What I call the fun stuff; posting and interacting.......but don't say I didn't warn you. It can be very addictive!