Twitter vs. X: Product Lessons For Startup Founders

TL;DR

Twitter/X shifted from a chronological feed of followed content to a TikTok-style algorithmic feed optimized for engagement (dwell time). This increased metrics like time spent and likes but lowered user satisfaction, leading to “empty calories” content (e.g., fistfight videos, political extremes).

Key insights

• Optimizing for dwell time or engagement as a single metric leads to low-quality content that users consume reluctantly (lizard brain) but ultimately dis-satisfies them and harms long-term retention.
• The “Not interested” feature is effective at curating the feed but is hidden behind a three-dot menu; users having to seek external instructions (Reddit threads) indicates poor product design.
• The blue check mark was overloaded by linking it to payment; it lost its credibility signal because a parody account with a blue tick now looks legitimate.