mouth positions, the degrees of different emotional expressions, etc. For these, we asked. Mechanical Turk workers the simple question "Does this photo shows a single selfie"? We then selected top 1000 photos for each city (i.e., photos which at least 2 workers tagged as a single person selfie).
To locate selfies photos, we randomly selected 120,000 photos (20,000-30,000 photos per city) from a total of 656'000 images we collected on Instagram. This project is based on a unique dataset we compiled by analysing tens of thousands of images from each city, both through automatic image analysis and human judgement. We wanted to keep the data size the same (to make visualizations comparable so our final set contains 640 selfie photos for every city).
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While most photos were tagged correctly, we found some mistakes. 2-4 Amazons Mechanical Turk workers tagged each photo. How we collected and filtered the data. More skilled workers) not only to verify that a photo shows a single selfie, but also to guess the age and gender of the person. We submitted these photos to Mechanical Turk again, asking three "master workers" (i.e.
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