I'm working on a side project which needs to access a large sample of images to do some magic with the provided target image. Since Facebook has a good store of

I'm working on a side project which needs to access a large sample of images to do some magic with the provided target image. Since Facebook has a good store of images, I'd chosen to use Facebook login (and to access user photos and profile pictures of his friends). With the increasing reports of Facebook horror stories, I'm redoing the backend to be generic so that I could easily integrate a new login system (twitter or my own) if something goes wrong. As per my project requirements, Facebook is the best option. So, the only care I'm taking to avoid get flagged by Facebook spam detection algos is to ask for as less permissions as possible from the user and avoid posting on walls without user confirmation.