Media entertainment

Posterous

Website

Posterous emerged from Y Combinator in the summer of 2008 as an innovative company focused on making blogging simple - as simple as sending an email - and now has more than 15 million monthly users. With the launch of Posterous Spaces, the company is bringing its trademark simplicity to help people share smarter with intuitive privacy controls t

Overview

Posterous emerged from Y Combinator in the summer of 2008 as an innovative company focused on making blogging simple - as simple as sending an email - and now has more than 15 million monthly users.

With the launch of Posterous Spaces, the company is bringing its trademark simplicity to help people share smarter with intuitive privacy controls to share selectively across multiple platforms.

Company description As recorded 2026-11-08

Founders & team

Sachin Agarwal

Founder/CEO

Cofounder of GrowSF. We're working to fix San Francisco. Previously: cofounder and CEO of Posterous. Before that, engineer at Apple. Posterous was acquired by Twitter, where I was a PM on consumer initiatives for 4 years. I shipped the photos experience (camera with editing/filters, photos in the timeline), updated profiles, completely rebuilt Direct Messages, and more. I later joined Lyft to work on social impact projects.

Founder profile As recorded 2026-09-15

Brett Gibson

Founder

Managing Partner at Initialized Capital. Previously wrote software at YC, and founded YC cos Posterous, Posthaven, Slinkset.

Founder profile As recorded 2026-09-15
11team members reported
Source-reported As recorded 2026-09-15

News & product activity

Sources & observations

Y Combinator

Profile depthverified profile
Website observationwebsite unreachable
Last website check2026-11-11
Location · source statedSan Francisco, CA, USA
Pricing evidenceNo pricing page confirmed
Maturity: Not assessed · 3 of 6 areas documented

Source-based assessment · automated evidence rules

The source reports an inactive or acquired company; current product identity needs review.

Maturity is an evidence-based assessment, not a success rating. It may understate the current stage where evidence is limited. Coverage records documented areas, not a complete or independently audited company history.

Stage definitions
independent websitesource corroborationdescriptive evidenceclassified market and modelsourced people