Posterous was a simple blogging platform started in May 2008, funded by Y Combinator. It supported integrated and automatic posting to additional social media tools such as Flickr, Twitter, and Facebook, a built-in Google Analytics package, and custom themes. It was based in San Francisco. Posterous agreed to be shut down in March 12, 2012 after much of the team was acquired by Twitter on March 12, 2012. In February 2013, Posterous announced that they would be shutting down the service on 30 April 2013. Following the shutdown, Posterous URLs displayed a "bye" page showing an image of an astronaut with a spanner and a satellite.

Updating to Posterous was similar to additional blogging platforms. Posting can be done by logging into the website's rich text editor, but it was particularly designed for mobile blogging. Mobile methods include sending an email, with attachments of photos, MP3s, documents, and video (both links and files). Many social media pundits considered Posterous to be the leading free application for lifestreaming. The platform received wide attention when leading social media expert Steve Rubel declared he was moving his blogging activity entirely to Posterous.

Posterous additionally had its own URL shortening service, which as of March 2010 could post to Twitter.

Posterous allowed users to point the DNS listing for a domain name or subdomain they already owned to their Posterous account, allowing them to have a site hosted by Posterous that used their own domain name.

In January 2010, the3six5, a Posterous-based storytelling project, launched. It was nominated for a Webby Award in 2011.

In May 2010, Posterous was recognised as one of the “2010 Hottest Silicon Valley Companies” by Lead411.

E-mail spoofing

Posterous allowed posting of content directly to one's blog via e-mail, choosing where to put the content based on the return address of the e-mail. While this feature was quite convenient, return e-mail addresses are easily spoofed, allowing for malicious users to post unwanted content on another person's blog. Posterous claimed that they can philtre out messages not actually sent by the account holder through additional means besides the return address. They didn't publish their methods, but it appears that they used a combination of SPF-checking and philtres on e-mail headers to verify that the e-mail client or machine from which the e-mails were sent are similar to previously verified e-mails. Posterous didn't offer any options for the user to require confirmation on all posts, no matter who sends them.

In June 2008, a blog post on TechCrunch challenged its readers to try to spoof the author's Posterous blog. Three posters were successful, out of quite a few attempts, but Posterous quickly fixed the security hole which allowed these posts to go through.


In August 2009, Posterous launched PicPosterous, an iPhone application for quickly posting photos to a posterous page.

On January 2011, Posterous launched an app for the Android platform which was supported by 9 different phone models.

Shutting down Posterous and building PostHaven

In March 2012, Posterous announced that they had been acquired by Twitter.

In February 2013, Posterous announced that they would be shutting down the service on 30 April 2013. Users would be able to back up and export their contents to additional blogging platforms. As of May 2013, Posterous founders were developing a similar but paid service called Posthaven. Until the Posterous API was shut down, Posterous users could export their data to their new Posthaven account. Posthaven pledged that they would never be acquired and weren't looking for any investors.