You even might find someone like that, and if you do, it's someone with a lot of time on their hands like a student with not much experience.
What those ideas (if I get to hear them) all have in common is that they need infrastructure behind it. Uploading pictures, movies, heck, even simple text need a place to be stored. That's definitely not your phone, especially if others need to be able to access it. Yeah, you can start off with hosting a little database and web front end on your DSL line (if you have one), but in the long run this will require some serious money. I'm not even talking about the people managing and creating it for you. I'm just talking about bandwidth, storage, electricity.
So, if you have an app idea, assess where you want to store what: if you have no concrete answers to those questions, shelve your idea until you do.. An app is nothing magical, it requires real resources, real work and thus real money.