Can I change the size of the saved image?
Since version 1.1, a menu is displayed in the lower right corner of the image to let you choose the output resolution — 2048, 1600, 800 or 500 pixels in the larger dimension. A lower resolution means the image will be saved faster. (Note that the pixel size is only indicative; Snap Filters won't enlarge an existing, smaller image. And the chosen size will be applied before the image is cropped to a square format; for 800 pixels for instance, the photograph will be resized to 800x600, then cropped to 600x600.)
Can I save the original image before I edit it?
When you take a photo with the iPhone's camera from within Snap Filters, the original is automatically saved before you can edit it. That only takes a couple of seconds, and makes sure you won't lose your shot if you get a call while you're setting up your photo filters.
How can I upload to Facebook/Flickr/Posterous from the application?
Those sites are among the few that allow you to post images quickly by e-mailing it to a special address.
All you need to do is find out what that address is, and then you can send images from Snap Filters — and if you're going to do that regularly, you can open the iPhone's Settings application and set the default e-mail address that you intend to send most photos to.
For Facebook, click here to find the e-mail address (look for the “Upload via Email” info, and you must be logged into the desktop version of the site).
For Flickr, click here to find the e-mail address (you must be logged in on Flickr).
For Posterous, you can start posting pictures without even registering first.
Why doesn't iPhoto/Flickr/... recognize where the photo was taken?
GPS coordinates are saved in an image's EXIF data; as far as we know, there is no way for an iPhone application to specify — or even conserve — EXIF information when saving an image to the photo library.
That means, even if you load a photo from your library, and that photo was taken from the iPhone's Camera application and includes GPS information, there is no way for Snap Filters to include that information in the saved image.
Why doesn't Flickr/... recognize the photo was taken on an iPhone?
Likewise, that information is stored in the image's EXIF data and we can't access it in any way.
Is there a version history?
Yes, it's here.