We've had a huge response to our class calculator this week, particularly across social media, following a major survey by BBC Lab UK. The survey suggests that traditional categories of working, middle and upper class are outdated and we all fit in to one of seven new classes.

The class calculator - which lets you work out where you might fit in amongst the new categories - has attracted about six million page views on the BBC News site, making it the second most popular article of 2013 to date. (The most viewed article this year has been the helicopter crash in Vauxhall in January.) Nearly 1.9 million of those views have come from those of you accessing the site on mobiles and tablets.

But one thing that really stands out is how widely the story has been shared across social media, with more than 300,000 shares so far. More than a quarter of links to the calculator have come from social networking sites.

More than half a million referrals came from Facebook alone, and about 107,000 from Twitter. This is a much higher number than we usually see shared across social media. If you compare the class calculator with the other top stories of the week, usually about 5% of known referrals come from social media sites.

So why has it proven so popular with our audience? Michael Orwell, a producer at BBC Lab UK, worked closely on the survey and said one of the best things about the project was that the audience contributed to new research with top academics.

The calculator itself, produced by the BBC News Visual Journalism team in collaboration with BBC Knowledge and Learning, lets everyone engage with the new model and discover where they might fit in.

Steve Herrmann is editor of the BBC News website.

As of Thursday, the Editors' blog will move to a different address on the BBC News website.

While this page will no longer be updated, it will stay here for reference.

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