Y Combinator ✓

@ycombinator · San Francisco, CA · joined 10 Feb 2010

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1 652 126Followers

368Following

26 759Posts total

9.3MViews on collected posts

Posts recentes

Y Combinator ✓@ycombinator23 Sep

Congrats to Alex, Ben, and @hubble_network (YC W22) on their $200M Series C at a $1.6B valuation! Hubble's satellite network lets any Bluetooth device connect directly to orbit with just a software update. Cellular covers about 15% of Earth's landmass, and tracking anything

1:42

40.3K views · 268 likes · 29 reposts · 23 replies Open on X →

Y Combinator ✓@ycombinator23 Sep

Congrats to @SpamRoss, @mduvall_, and @numeral (YC W23) on their $100M Series C! Numeral automates sales tax compliance end to end, from registrations and calculations to filings and payments. They handle US sales tax plus VAT and GST across more than 90 countries, all in one

0:37

42.3K views · 177 likes · 12 reposts · 10 replies Open on X →

Y Combinator ✓@ycombinator23 Sep

Attack drones are reshaping modern warfare, but many countries still lack an effective way to defend their airspace. Earendil Robotics is building autonomous interceptors, along with the software and training needed to stand up that capability from scratch. Their systems can htt

1:42

30.8K views · 97 likes · 10 reposts · 15 replies Open on X →

Y Combinator ✓@ycombinator22 Sep

The YC Early Access Network is filling up fast. On Oct 22, tech leaders from high-growth startups to the Fortune 500 meet the best companies building enterprise AI. Be in the room. Request one of the remaining spots in Early Access now. https://t.co/vnjnhOq3mI 50.1K views · 197 likes · 22 reposts · 4 replies Open on X →

Y Combinator ✓@ycombinator22 Sep

Congrats to @CalebPeffer, @ericciarla, @nickscamara_, and @firecrawl on their $75M Series B! Firecrawl turns the web into clean, structured data for AI agents, with more than 1.5 million people building on their API. They're also launching Alexandria, a knowledge library where

1:23

36.1K views · 241 likes · 20 reposts · 21 replies Open on X →

Y Combinator ✓@ycombinator22 Sep

Confido (@confidotech) is building the AI workforce for consumer brands, automating everything from accounting to sales and demand planning. They work with brands like Olipop and Dude Wipes, as well as divisions of Mars and Unilever, and recently raised a $55 million Series B led

8:53

42.1K views · 117 likes · 2 reposts · 12 replies Open on X →

Y Combinator ✓@ycombinator18 Sep

Congrats to @angle_health (YC W20) on their $200M Series C at a $2.7B valuation! They're an AI-native health benefits platform built for small businesses. Health insurance is one of the hardest, most regulated industries a startup can enter, and Angle is already profitable on 47.1K views · 224 likes · 15 reposts · 19 replies Open on X →

Y Combinator ✓@ycombinator18 Sep

Kastle is building AI employees for banks. Its agents automate operations across mortgage servicing, consumer lending, and other back-office functions. Today, Kastle works with 10 of the top 25 mortgage servicers and has processed more than $2 billion in transactions. The https:

11:47

55.9K views · 169 likes · 11 reposts · 32 replies Open on X →

Y Combinator ✓@ycombinator17 Sep

YC works with thousands of founders every year, which gives us an early look at how startups are changing. Right now, the shift is striking: startups are moving from bits to atoms, nearly one in five YC companies has a solo founder, and companies are reaching meaningful revenue h

36:28

107.2K views · 486 likes · 46 reposts · 73 replies Open on X →

Y Combinator ✓@ycombinator17 Sep

Raindrop (@raindrop_ai) is building the safety layer for AI agents. As agents get more capable and take on more complex work, Raindrop detects when they go wrong in production, from failed tool calls and hallucinations to problems companies didn’t even know to look for. Now https

10:17

58.3K views · 226 likes · 23 reposts · 27 replies Open on X →

Y Combinator ✓@ycombinator14 Sep

@ycombinator YC being "bullish on the Clarity Act for the future of finance" is quite the pivot for an incubator built on regulatory arbitrage, the whole pitch used to be "move fast, apologize to the regulator later." Now the regulator's the exit strategy? 77 views · 2 likes · 1 reposts · 0 replies Open on X →

Y Combinator ✓@ycombinator14 Sep

Though most won’t even realize they’re using blockchains, we expect many teams to benefit with use cases like: - Instantaneous and global payments for less than a cent - Marketplaces settling with sellers in seconds - Assets trading 24/7 4K views · 15 likes · 0 reposts · 2 replies Open on X →

Y Combinator ✓@ycombinator14 Sep

For too long, institutions were scared to invest and startups often skipped building for the US. The US Clarity Act provides clarity for the next wave of builders. The Senate should pass it. 2.9K views · 7 likes · 0 reposts · 0 replies Open on X →

Y Combinator ✓@ycombinator14 Sep

Blockchains allow instantaneous asset movement for pennies, global access, 24/7 trading, and open APIs. What the internet did for information, blockchains do for every asset, including money. Adding an API to every asset is especially a big deal. Suddenly, anyone can build on 2.8K views · 14 likes · 0 reposts · 1 replies Open on X →

Y Combinator ✓@ycombinator14 Sep

The US CLARITY Act has an initial vote this week in the Senate. We’re bullish on the Clarity Act - for the future of finance and for American fintech startups. By specifying regulators and clarifying rules, Clarity makes it easier for American founders to build with 59.3K views · 227 likes · 28 reposts · 30 replies Open on X →

Y Combinator ✓@ycombinator12 Sep

The best outbound starts before you automate anything. Founders need to learn who actually has the problem, what gets their attention, and what makes them reply. YC Visiting Partner @ChristinaG325 recommends doing at least your first 100 outreaches by hand so you can learn those

12:41

65.5K views · 494 likes · 35 reposts · 64 replies Open on X →

Y Combinator ✓@ycombinator11 Sep

Rare earth magnets sit inside nearly every electric motor, but 90% of the material is conventionally thrown away. Mass Magnetics (S26) is recycling magnets from EV motors into new ones for robotics and defense, avoiding much of the capital-intensive refining required by mining.

2:50

81K views · 346 likes · 31 reposts · 36 replies Open on X →

Y Combinator ✓@ycombinator10 Sep

Ashton joined us at Demo Day! https://t.co/7uOcxgLcnS

56.6K views · 317 likes · 12 reposts · 20 replies Open on X →

Y Combinator ✓@ycombinator8 Sep

Happy Alumni Demo Day! https://t.co/ka1L3YOyEr

0:26

61.8K views · 251 likes · 18 reposts · 12 replies Open on X →

Y Combinator ✓@ycombinator8 Sep

@ycombinator The static CRM is dead. Automating relationship mapping is exactly the kind of smart AI integration enterprise sales teams need right now. 38 views · 6 likes · 0 reposts · 0 replies Open on X →

Y Combinator ✓@ycombinator8 Sep

https://t.co/BIechpvlve https://t.co/A5e9KtW5TO

4.9K views · 7 likes · 1 reposts · 1 replies Open on X →

Y Combinator ✓@ycombinator8 Sep

Centralize (YC W24) is building the GPS for enterprise deals. It turns emails, calls, CRM data, and other customer interactions into automatic org charts that show sales teams who they know, who they’re missing, and the relationships that can help them win an account. They https

8:12

57.1K views · 128 likes · 9 reposts · 20 replies Open on X →

Y Combinator ✓@ycombinator8 Sep

Congrats to @AndyLapsa, @Rkt_Da, and @stoke_space (W21) on their $1B Series E! They're building Nova, a rocket designed to be fully reusable, meaning both stages fly back and fly again. Today's rockets mostly reuse the booster and throw away the upper stage on every flight. 39.8K views · 89 likes · 11 reposts · 12 replies Open on X →

Y Combinator ✓@ycombinator8 Sep

Introducing the YC Early Access Network. 4x a year, senior technology leaders get early looks at YC's enterprise AI companies and help shape their roadmaps. Invite-only, by application. Fall '26 kicks off Oct 22 in SF. Apply now: https://t.co/vnjnhOpvxa https://t.co/JyK5P7PDV

1:12

134.6K views · 575 likes · 53 reposts · 40 replies Open on X →

Y Combinator ✓@ycombinator7 Sep

Harnesses often get dismissed as just scaffolding, just prompt engineering, and not real research. But that couldn't be farther from the truth. The same model weights that score 30% on ARC-AGI score 95% with a better harness. So we gathered a group of researchers and founders ht

60:10

462K views · 3.8K likes · 435 reposts · 170 replies Open on X →

Y Combinator ✓@ycombinator4 Sep

@ycombinator @ollama @jmorgan open weights solved the meter for a lot of teams. what’s still painful day to day is keeping state, tools, and a sandbox coherent across a long agent run. 73 views · 4 likes · 0 reposts · 0 replies Open on X →

Y Combinator ✓@ycombinator4 Sep

Open models are closing the intelligence gap, says @ollama's @jmorgan. That opens up a new opportunity for founders: coordinating fast, cheap models to solve more complex problems. “We’re maybe less than three months behind between the frontier closed models and the open models.

2:19

54.3K views · 139 likes · 18 reposts · 30 replies Open on X →

Y Combinator ✓@ycombinator4 Sep

https://t.co/OZJErQTy1I https://t.co/h11S4wxSWH

6.8K views · 18 likes · 0 reposts · 1 replies Open on X →

Y Combinator ✓@ycombinator4 Sep

🦙 @ollama is used by 9 million developers and 85% of the Fortune 500, giving co-founder and CEO Jeffrey Morgan (@jmorgan) a unique view into which AI models people are actually using and how that’s changing. Right now, the biggest shift he sees is toward open models, driven by h

57:15

307.3K views · 319 likes · 41 reposts · 46 replies Open on X →

Y Combinator ✓@ycombinator3 Sep

At @HeartAerospace, @AndersForslund1 built the company one material milestone at a time, using each one to earn the credibility and capital to build the next. “We really had no technology. I came to YC Demo Day with a little 3D-printed model.” “We went from having the LOIs to h

1:25

51.6K views · 173 likes · 22 reposts · 15 replies Open on X →

Em comparação com contas do mesmo porte

53 posts dos últimos 90 dias, ao lado da faixa de 1M–10M seguidores. aparece para muita gente, mas poucos desses espectadores reagem.

Mediana de visualizações42 327esta conta14 648mediana para 1M–10M

Alcance, %2.56%esta conta0.74%mediana para 1M–10M

Engajamento, %0.50%esta conta0.70%mediana para 1M–10M

Métrica	Esta conta	Mediana para 1M–10M	Proporção
Mediana de visualizações por post	42 327	14 648	2.89×
Alcance (visualizações ÷ seguidores)	2.56%	0.74%	3.46×
Taxa de engajamento	0.50%	0.70%	0.72×

Outras contas desta faixa → Comparar com outra conta → Como estas referências são construídas →

Growth & engagement

How the posts we collected actually performed: views and reaction rate post by post, what the audience did with them, and where the follower count goes.

Views per post

2.8K14 Sep

2.9K

58.3K17 Sep

107.2K

55.9K18 Sep

47.1K

42.1K22 Sep

36.1K

50.1K

30.8K23 Sep

42.3K

40.3K

Last 14 collected posts, oldest on the left. The scale is logarithmic: one post can outrun the rest a hundred times over.

Engagement rate per post

0.58%14 Sep

0.24%

0.43%

3.90%

0.48%17 Sep

0.59%

0.39%18 Sep

0.56%

0.33%22 Sep

0.79%

0.45%

0.41%23 Sep

0.47%

0.82%

Reactions — likes, reposts, replies and quotes — divided by views. Median for 1M–10M accounts is 0.70%.

What the audience does

Likes44.5%9 131 in total

Reposts4.4%905 in total

Replies3.6%736 in total

Quotes1.1%234 in total

Bookmarks46.3%9 496 in total

Share of every reaction we collected for this account. Replies mean argument, reposts mean endorsement, bookmarks mean the post was worth keeping.

Followers by day

20 Sep23 Sep

Daily snapshots since 20 Sep 2026; the dashed line is the starting count.

Posts recentes

Em comparação com contas do mesmo porte

Growth & engagement

Views per post

Engagement rate per post

What the audience does

Followers by day

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