Some other ideas: scavenger hunts and treasure maps/hunts made by others, you can make the scavenger hunt list and treasure maps yourself and also include ones made by sponsors/advertisers that take you through/by certain shopping spots or stores enable use with quadcopter so people can draw/create their own virtual courses that they can physically fly through. The benefit of this is that if you hit a loop then you're not damaging your drone because it's a virtual obstacle - great for training restaurant/travel tips and suggestions. People can draw a positive review in green or a negative review in red. One can then swipe through these reviews on the storefront or display the ratio of positive vs negative reviews which will be done by tallying the number of messages left in green vs red. I think the traveling aspect will really set this apart from something like yelp because it can be applied to anything and the places don't need to be registered/listed like they are in yelp. directions to certain places indoors. For instance if you had a trade show, you can draw a publicly viewable path to their table that people can register to see. a game similar to draw something a free draw option so people can use this to draw and map out furniture in a new apartment or rearranging the furniture
There's many more ideas related to what you currently have. These are just off the top of my head, I'm sure if you got the team together you can think of many more/better options.
If it doesn't need the person to be at the location, it is just another picture sharing app. If it does require that, I can see why it would get old quite fast.
Looks novel at most, I doubt people crave a new "social network" anyway. The mere thought of it makes me annoyed tbh.
- My friends don't use this app, so there is the chicken & egg problem that exists with all social networking services (can I see public drawings?)
- Assuming chicken & egg problem did not exist or you have solved it, how often the friends I am in touch with would draw a message in a particular place and send it to me and how often do I remember to check their message when I pass by that place?
Wouldn't it attract more people if it would have been public so I could see any drawings, information about the building or poster images by anyone?
Pivoting towards a pure anonymous entertainment/game maybe necessary?
Overall it is a cool idea but would people use it without a big pivot? I doubt so or if they do I'm missing something here