Anyone know a good site or document explaining the best export settings for things like Facebook, shutter fly to order large photos, etc.
The settings you want on Facebook are entirely different than for ordering large photos.
Facebook: check Resize to Fit, select Long Edge to be 1600 pixels (or thereabouts, it will look fine on Facebook), Quality of about 70
Order large photos: do not check Resize to Fit, before you upload you probably want to crop the photo to the desired print size aspect ratio, Quality 70 or 80
Thanks -- this will help greatly.
You are Welcome, Glad to help.