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New apps aim to make the decision easier by selecting clips to suit a person’s personality and mood. An app called 5by helps users sort through content online by selecting videos from YouTube and the video-sharing website Vimeo to suit what they are doing, and how much time they have. “When you go to YouTube you see a sea of content and recommendations, but sometimes it’s hard to figure out what to watch,” said Greg Isenberg, chief executive officer of 5by, a Canadian company now based in San Francisco after being acquired by the website StumbleUpon in 2013. The app, for iPads and iPhones in English, asks users questions about topics such as their activities, what their friends are like, and their dream vacation to understand the kind of video they would enjoy.