The study found that posts with some personal analysis draw larger views than those without. It also found photo thumbnails drove traffic.
As for the length of this analysis, the study found a curious result: one-liners can draw highly varying responses of up to 15 times the average amount of engagement, but three- and four-line analyses also draw consistently higher engagement.
Posts Thursday through Sunday drew higher engagement, likely due to the greater reading time (and presumably engagement time) on weekends.