Can you share a case study where a significant UX change led to improved user engagement?

Let's take the example of Snapchat. 

Challenge
Snapchat needed to boost engagement beyond private Snaps and create a reason for users to stay active daily.

Solution
In 2013, Snapchat introduced Stories, allowing users to post photos and videos visible to friends for 24 hours. The swipe-based navigation made it easy to consume content, while the ephemeral nature created urgency (FOMO).

Impact

• Increased DAUs: Grew from 46M in 2013 to 158M by 2016.
• Higher Engagement: Users spent more time on the app, with Stories driving frequent visits.
• Industry Influence: Stories became a widely copied format across social media.

Takeaway
Ephemeral, easy-to-use features and social sharing foster long-term user engagement and retention.