In effect, it gauges how busy the user is and the urgency of the new data, whether in the form of e-mails, telephone calls or text messages.

ECONOMIST: Computing

Rather than wave and whistle and wait on a busy corner, a user simply fires up the Uber app and demands a ride.

ENGADGET: Uber tackles Taxis in Chicago with Uber Garage experiment

While the rest of the Web world touts the merits of homemade video and other user-generated content, AOL was busy touting the benefits of the expensive stuff made by pros--stuff that looks a lot like television.

FORBES: Magazine Article

Some are due to faulty readers, some are problems with the auto-complete feature Transport for London (TfL) can turn on at busy stations like Covent Garden, or sometime it's plain old user error.

BBC: Paddington walk incurs ?4.60 erroneous Oyster charge

"Our servers are very busy right now, so it may show you some errors, " the company wrote to a user on its Twitter feed.

CNN: Instagram backtracks after user privacy revolt