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Got a big idea? Why not ask a stranger to invest online?

If you have a big idea, but you don't have the cash to make it happen, then why not ask a stranger for the money?

More and more people are now bidding for funding on the internet, raising hundreds, thousands, and sometimes millions of pounds for projects like starting up a business or making a film.

It's called "crowd funding" and it's taking the South by storm. Sarah Cooper's been finding out how it works.