Copying Snapchat stories “was the best decision Instagram ever made.” It’s been two years since the copycat move, and the feature now attracts 400 million daily users, twice that of Snapchat’s entire app—making Instagram Stories “arguably the fastest-growing media format ever.” Our Social Media Tracker aligns, showing that 49% of 13-20-year-olds use the feature.

Copying Snapchat stories “was the best decision Instagram ever made.” It’s been two years since the copycat move, and the feature now attracts 400 million daily users, twice that of Snapchat’s entire app—making Instagram Stories “arguably the fastest-growing media format ever.” Our Social Media Tracker aligns, showing that 49% of 13-20-year-olds use the feature. And then there’s the potential for vertical video ad revenue, which experts are “optimistic” about. (Recode)