Every now and then, I’ll get a push notification from Line telling me about its latest sticker packs. Today, the messaging app pointed me to a free bundle based on PSY – best known for his internet sensation ‘Gangnam Style‘ – but the download method struck me as unusual. Rather than paying for the pack or downloading it immediately, Line is requiring users to watch PSY’s latest single – Hangover, featuring Snoop Dogg – over on YouTube first. You can press the back button almost immediately to get the stickers, but I suspect most people will sit through the music...

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