Food Photography in Restaurants

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I’m at a loss for how to take photos of food with my phone while dining in a limited lighting, fine dining establishment. I was using the flash on my phone, but the photos came out overexposed. I’ve tried it without the flash and the photos are too dark. I’m trying to be somewhat discreet and don’t want every course to look like a photo shoot. What shall I do? I take photos, write blogs, post to twitter and Facebook all via my phone. Is there a way to solve this dilemma? Or, do I need to make the adjustments on my laptop? Also, how do I upload a picture to twitter from my iPhone? Anybody?