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This post originally appeared on the American Express OPEN Forum , where Mashable regularly contributes articles about leveraging social media and technology in small business. So, you're a small or medium-sized business, and you want to build a Facebook, mobile or web app. You're undertaking something that's both simple and ambitious, and you're probably looking for a bit of help. But do you use one of the many do-it-yourself tools online, or do you call in a professional?

