Aside (maybe off-topic): "...solve a problem that is important to someone. Wanting your phone's pictures to look better turns out to be a valuable problem for m

Aside (maybe off-topic): "...solve a problem that is important to someone. Wanting your phone's pictures to look better turns out to be a valuable problem for many people." I'd agree with the first part but not really for the second. You either have to solve a problem, or make something that's fun. Nail either of those and you've probably got something worthwhile. In this case I'd put Instagram in the latter category.