Reddit $RDDT down 12% after hours.

The issue? Daily active users came in light, and Q4 guidance missed expectations.

This is a reminder that for ad-driven platforms, user growth matters more than almost anything else. You can optimize revenue per user, but if the user base stalls or shrinks, the growth story breaks.

Reddit's been riding momentum since its IPO, but now the market's asking: can it keep pulling in new users, or is it just cycling the same crowd?

Guidance misses like this tend to reset valuations fast. Worth watching how management addresses retention and engagement on the call.