Spotify
Spotify’s personalization is almost entirely about listening time. Spotify constantly is trying to keep you listening longer through features like “Discover Weekly” and the daylist (daily mixes). You don’t need to set anything up—Spotify learns as you listen. More listening leads to better retention and more paid subscriptions. The ROI is simple: more time in the app means more people pay.
LinkedIn uses personalization to increase how often you come back. Your feed, job picks, and profile alerts are all built to get you to check the app again. LinkedIn asks for a lot of information upfront, but that data helps the recommendations work. The ROI comes from more sessions, which lead to more ads, more job applications, and more revenue.
TikTok
TikTok’s whole product is personalization. The For You Page adapts in minutes and reacts to every swipe. TikTok doesn’t need much profile data, it just watches how you use the app. This helps them target ads extremely well. The ROI is huge: better targeting makes advertisers spend more.
