I didn't like iPhoto from the start, but I thought I'd give it another go for the use of photo stream. I installed the newest version, and made sure my settings were all correct. The biggest thing was to make sure that iPhoto did NOT copy photos into iPhoto library. But after importing a few hundred photos, the library was 5GB??????? Come to find out, it saves the full size image for the thumbnail in the iPhoto library. So technically, it's not copying the photos but it's saving the full image for thumbnails. How stupid is that? I would like to use it, but with all the doubling of photos, it just eats up my memory. I would normally be okay with copying the photos to the iPhoto library, but I like to keep track of where my photos are, and am not okay with them 'disappearing' into the indiscernible iPhoto library abyss. TL;DR, iPhoto making copies of pictures when it shouldn't, am I doing something wrong?