Experiment: two column/single column on mobile

Setup

In this experiment, we tested the hypothesis whether showing larger thumbnails on mobile (in a single column instead of two columns) is more engaging.

Mobile

Results

• one column is slightly worse, all metrics trending down.
• note that this experiment was diluted by the carousel experiment: when we organize results into carousels, there is no difference between base and experiment arms, ie. ⅓ of the traffic is useless.