This is something I would personally use but won't simply because there's no way to stop it. It seems like a bad idea to just add a 'cancel' button but I'm not willing enough to post a goal without a lot of detail about the process, how the votes determine if a photo gets posted to Facebook or not, etc. Let's say I made a goal to exercise 3 times a week for the next 3 months and then broke my leg a week in. Boom, picture released. I also wonder how many people would vote that you didn't complete a goal when knowing they would be rewarded with a compromising picture (if familiar with the app). A picture needs to be bad enough to motivate. I don't have a solution for you unfortunately, but hopefully this helps you see the thought process of a potential user who won't try it and help you from another perspective.
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This is something I would personally use but won't simply because there's no way to stop it. It seems like a bad idea to just add a 'cancel' button but I'm not willing enough to post a goal without a lot of detail about the process, how the votes determine if a photo gets posted to Facebook or not, etc. Let's say I made a goal to exercise 3 times a week for the next 3 months and then broke my leg a week in. Boom, picture released. I also wonder how many people would vote that you didn't complete a goal when knowing they would be rewarded with a compromising picture (if familiar with the app). A picture needs to be bad enough to motivate. I don't have a solution for you unfortunately, but hopefully this helps you see the thought process of a potential user who won't try it and help you from another perspective.