First of all, if you’re not using SuperAlbum yet, you should. It’s a great app for browsing, printing, and creating slideshows of all your photos, albums, and videos from Flickr, Facebook, Twitter, Evernote, Instagram, YouTube, 500px, and more.
One of its especially neat tricks is that it can share photos between services. For example, you can tap a Facebook photo, then tap Export to share that photo to Twitter or Flickr.