A Google employee has mistakenly posted information to an official Google blog that she had intended to publish in her personal blog, in the latest blogging faux pas for the search engine giant.

Two postings about skull-shaped sweets appeared on Blogger Buzz, the official voice of Google's Blogger service, on Tuesday. Their topic and informal tone immediately led readers to wonder about their legitimacy.

Google has said it removed the postings soon after they were published. The employee who published the postings by mistake is a regular contributor to Blogger Buzz, according to a company spokesperson.

Last week, Blogger suffered an outage that kept both Blogger.com and the Blogspot hosting service offline for two hours. That kept the many official Google blogs hosted on the Blogger platform offline. Google later said a "network malfunction" caused the outage.

Earlier this month, a hacker broke into Google's main official blog, which is hosted on Blogger, and posted a false message saying that the company had decided to cancel a joint click-to-call advertising project with eBay.

Google patched the hole and removed the posting, but the intruder's message was widely noticed and triggered significant speculation and confusion among Google observers.

In March, Google staffers deleted the Google Blog by mistake and someone unaffiliated with the company briefly took control of the web address.

Like all companies that store sensitive data from consumers and organisations, Google is held to a high standard when it comes to mistakes such as these ones. Displays of carelessness or security vulnerabilities that affect Google's services undermine users' trust, critics say.