David Lieb

General Partner, Y Combinator · 7 appearances on the record.

computed by AI from the episodes · how this works → · full disclaimer →

founderexecutiveinvestoroperator@dflieb ↗ycombinator.com/people/david-lieb ↗

David Lieb co-founded and served as CEO of Bump, a mobile sharing app acquired by Google in 2013. Following the acquisition, he created and led Google Photos before returning to Y Combinator as an investing partner.

34statements → 18claims → 5claims resolved → 60%fully supported → 3.65/5average certainty → 1.94/5average debate potential →

3 supported 2 partly supported 0 contradicted 3 not yet assessed 10 not checkable as stated how the 18 claims stand · each chip opens the sources

2 predictions · 16 assertions · 6 opinions · 7 insights · 3 disclosures · every statement was checked. The predictions and assertions are the 18 claims: statements the public record can support or contradict. 5 are resolved, 3 are not yet assessed, and 10 name no date, number or outcome precise enough to check. Everything else (opinions, insights, what ifs, disclosures) can never be settled by the record, so it carries no assessment.

The record, in short

What the tape says about how David argues and how the claims held up. Everything they said, and everything said about them, is in the tabs below.

Their most notable supported claim

Assertion Supported

Lieb: Musk said Twitter should make far-left and far-right equally unhappy

“I think Elon explicitly said, when you're using Twitter, you should feel equally bad if you're on the far left or on the far right.”

David Lieb Nov 21, 2024 ▶ 2:16 Twitter vs. X: Product Lessons For Startup Founders · Y Combinator

Expressed certainty vs assessment result

none yet certainty 1

none yet certainty 2

75% certainty 3

83% certainty 4

none yet certainty 5

weighted support: a fully supported claim counts one, a partly supported claim counts half. Each filled bar is clickable and opens exactly those claims; "none yet" means nothing said at that certainty level has resolved yet

What they said34 Episodes7

Everything David Lieb said on the Y Combinator Startup Podcast that made the record, most notable first. Filter by type, assessment or year in the ledger →

Assertion Not publicly verifiable

Bump Was the #2 App on the App Store by Demo Day

“Throughout the batch, the product kept growing, and by the time demo day came around in August, we were actually the number two app on the entire app store.”

David Lieb Dec 18, 2024 ▶ 5:29 How David Lieb Turned a Failing Startup Into Google Photos | Backstory · Y Combinator

Assertion Open · timeframe Dec 2024

Steve Jobs Featured Bump's Icon in an Apple Keynote Presentation

“Steve Jobs put our icon on a slide on one of his pitch decks.”

David Lieb Dec 18, 2024 ▶ 6:00 How David Lieb Turned a Failing Startup Into Google Photos | Backstory · Y Combinator

Disclosure

Bump Burned Up to $15 Million Before Pivoting to Photo Sharing

“We'd burned ten million dollars or more, probably, probably more, probably fifteen million dollars.”

David Lieb Dec 18, 2024 ▶ 7:29 How David Lieb Turned a Failing Startup Into Google Photos | Backstory · Y Combinator

Assertion Partly supported

Bump Reached 150 Million Users

“We had a hundred and fifty million users of Bump.”

David Lieb Dec 18, 2024 ▶ 9:21 How David Lieb Turned a Failing Startup Into Google Photos | Backstory · Y Combinator

Assertion Not checkable as stated

Google Photos Was Built From Scratch in About Nine Months

“Once we got the green light you know, it was a team of, like, 20 of us from Bump latched on to maybe a team of, like, a hundred people, core people from Google with access to all of this incredible technology, and we were able to build all of Google Photos bas…”

David Lieb Dec 18, 2024 ▶ 13:46 How David Lieb Turned a Failing Startup Into Google Photos | Backstory · Y Combinator

Assertion Not checkable as stated

Early DARPA Grand Challenge Work Spawned Modern Autonomous Vehicles

“Ended up working on what would be the beginning of the DARPA Grand Challenge, which would turn into the self-driving cars that we have today.”

David Lieb Dec 18, 2024 ▶ 1:12 How David Lieb Turned a Failing Startup Into Google Photos | Backstory · Y Combinator

Assertion Not checkable as stated

Lieb Conceived Bump During an Accounting Class at Chicago Booth

“The idea that you could Share contact information by taking two phones and bumping them together popped into my head in an accounting class one day.”

David Lieb Dec 18, 2024 ▶ 2:39 How David Lieb Turned a Failing Startup Into Google Photos | Backstory · Y Combinator

Assertion Supported

Bump Launched on the App Store in 2009 With Zero Promotion

“The app went live at the end of March, 2009, and we did no promotion. It just went on the App Store, and some people found it.”

David Lieb Dec 18, 2024 ▶ 3:06 How David Lieb Turned a Failing Startup Into Google Photos | Backstory · Y Combinator

Assertion Not publicly verifiable

Bump Received Just $16,667 in Initial Y Combinator Funding

“We got 16,667 dollars of funding, which in hindsight is pretty small, but it was totally sufficient to come out to the Bay Area, live on a friend's floor, and build Bump some more.”

David Lieb Dec 18, 2024 ▶ 4:58 How David Lieb Turned a Failing Startup Into Google Photos | Backstory · Y Combinator

Assertion Supported

Lieb: MC Hammer invested in Bump

“MC Hammer invested.”

David Lieb Dec 18, 2024 ▶ 5:55 How David Lieb Turned a Failing Startup Into Google Photos | Backstory · Y Combinator

Appearances (7)

Episode	Date	Speaking time
Aaron Levie: Why Startups Win In The AI Era · Y Combinator	Sep 16, 2025	4m
Aravind Srinivas: Perplexity's Race to Build Agentic Search · Y Combinator	Jul 11, 2025	5m
How To Design Better AI Apps · Y Combinator	May 23, 2025	3m
How AI Coding Agents Will Change Your Job · Y Combinator	May 9, 2025	7m
How To Build The Future: Aravind Srinivas · Y Combinator	Feb 21, 2025	4m
How David Lieb Turned a Failing Startup Into Google Photos \| Backstory · Y Combinator	Dec 18, 2024	17m
Twitter vs. X: Product Lessons For Startup Founders · Y Combinator	Nov 21, 2024	10m

David Lieb

The record, in short

Their most notable supported claim

Expressed certainty vs assessment result

Appearances (7)

Turn any episode into a week of clips.