Google Photos Product Lead and Bump Cofounder David Lieb with Gustaf Alströmer

TL;DR

David Lieb, cofounder of Bump and product director at Google Photos, recounts Bump’s viral growth (150M downloads) through physical novelty and word‑of‑mouth, but explains that low usage frequency and inability to monetize at VC‑required scale ultimately killed it as a business.

Key insights

• Bump’s growth was driven entirely by word‑of‑mouth and the physical novelty of bumping phones; the company spent $42 on marketing (a video tape and felt for the demo).
• The “chicken‑and‑egg” requirement (both users needed the app) became a distribution driver because the behavior was novel enough that people would wait for a friend to download it.
• Bump’s long‑term cohort retention was “really good” on a wide time window, but frequency of use was very low; infrequent usage made it impossible to extract enough value per session to justify VC‑scal