The Big, Online, Business Idea

I'm looking to create a new business. A business powered by Freelancer. Starting with the idea. A great idea, that's big, bold and clever. What I need: an idea, presented in a few paragraphs, explaining its purpose and how and why it would work - in written English. I only have 2 criteria: 1. There needs to be proven demand - I'd rather do something thats already being done, but do it better and differently, very differently. It could be something already online -- think Friends Reunited to Facebook or it could be bringing something offline, online -- think taxi's to Uber or Kodak to Instagram (I told you I was thinking big!) - key thing here is it needs to be different and have a clear competitve edge over anything existing. 2. As you may have guessed by the examples above, it needs to be a web-based service or user managed marketplace (think ebay/airbnb not amazon, involving logistics) aimed at consumers and funded by subscriptions or ads (no physical product) with ability to start small and scale globally Once I have the right idea, I'll be running separate projects for the research and business plan and moving through the normal startup phases, all powered by the Freelancer community, so there's lots of opportunity for the person with the right idea to stay involved...