My vote is for IMDB. It hasn't been updated in years. I really like their movie database versus the others and it's a shame we are stuck with an outdated featureless buggy app since mid-2012. In addition, Instagram only because they never completed it, the beta was never updated. I expect that to ultimately change though at the rate we are going, they are probably going to wait until Windows 10. I disagree about the others like Facebook, Facebook Messenger, Amazon, eBay, Skype, Kindle - sure, there might be a feature or two missing but not to the point where they are pathetic.