It’s basically an app that has you take your photograph, insert a filter, then post to facebook, twitter, etc. Instant shiney beautiful filtered photo :3
If nothing, the app lets you post the image quite a bit easier then through the iphone camera and would be quite nice as a one a day project. And your iphone is likely to be on your person when you happen to go for a nice walk through town.
I retook the photo, showing another of the filter effects (they also add these border things) and the original file. If you try it and are attached to your original unedited images, make sure not to add the filter before saving the file. You can always choose an image and add a filter to it afterwards.