http://www.huffingtonpost.com/2009/01/31/google-glitch-briefly-dis_n_162822.html

Google has become part of so many people's lives on this planet, like a dependable appendage -- until suddenly it malfunctions.

Here’s the gist of Google’s explanation: What happened? Very simply, human error.

Google flags search results with the message “This site may harm your computer” if the site is known to install malicious software in the background or otherwise surreptitiously.

Fortunately, our on-call site reliability team found the problem quickly and reverted the file. Since we push these updates in a staggered and rolling fashion, the errors began appearing between 6:27 a.m. and 6:40 a.m. and began disappearing between 7:10 and 7:25 a.m., so the duration of the problem for any particular user was approximately 40 minutes.

glitch (機械・計画などの)欠陥，故障

appendage 付加物，付属物

gist [the 〜] 〔…の〕要点，要旨

surreptitious (特に，不正な理由で)人目を忍んで行なう，内密の

stagger　よろめく，よろよろする

revert 〔もとの習慣・状態などに〕帰る，逆戻りする