What's interesting is that each physical copy of Taylor Swift's latest album, 1989, includes 1 of 5 possible sets of 13 polaroids[0], and it's set to have the biggest sales week (in the US, presumably) of any album since 2002[1]. I wonder if she didn't steal this idea from AKB48.

0: https://twitter.com/taylorswift13/status/526459191826079744

1: http://www.billboard.com/articles/columns/chart-beat/6304336...