Not sure how long this has been a feature on the Economist’s website, but aggregating readers’ comments around different topic areas is an interesting way in to a story.

The cloud of terms show the most popular topics from across the site and can be viewed for one-week, two-week or a 30-day period:

Clicking on a term displays all reader comments from across the website relating to that subject, with a link to what article they were left on.