I'm so confused about how photostream works. At some point, it stored a ton of photos. I know there are rules from this support page http://support.apple.com/kb/HT4858 but I'm way under the limit. I also have other confusion. I have different sets of photos showing between the photostream on my iPhone vs the iPad vs iPhoto on my Mac. They all seem to have different sets of photos. On the iPhone, it seems to not date as far back as my iPhoto on my mac. I'm also confused to which version of the photostream actually plays on my AppleTV and Macbook when I have the screensaver on.