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I'm not sure I'd necessarily say the process of shooting a photo with your iPhone and then opening your Facebook app to upload it is a particularly stressful one, but I suppose if you're looking to cut down on the extra step, SayCheeze might just be for you.
SayCheeze works as an alternative app to your regular iPhone camera app, except in order to use it, you must link your Facebook account to the app. Once you're linked up, SayCheeze will automatically upload any photo you take while using it directly to your Facebook page.
This sort of thing could get a little harrowing for a number of reasons. Namely, who wants every terrible picture to be viewable? And second, having numerous photo albums (by day), seems unnecessarily messy compared with the more general "mobile uploads" album that Facebook's photo uploader uses.
Luckily, you can turn the auto uploader off, but at that point you'll be using the app just like you would your normal iPhone camera. And sure, SayCheeze is free, but if it's free and doesn't offer you any extra incentive to use it, what's the point?
If you're really into the idea of linking your camera directly to Facebook, this'll be a fair option. Though it won'[t quickly upload photos already on your phone, either. For those who don't find an instant upload enthralling, there's not really enough here to justify the download.