Keep track of what Kindle users are highlighting

You can keep track of what Kindle users are highlighting at the Amazon site at http://kindle.amazon.com/popular_highlights.

Amazon organizes the data by all-time and heavily highlighted recently. All-time is self-explanatory, by the "recently" list is not explained in any detail on the site. Its probably because its still early days and they're being flexible with the number crunching until some some sort of pattern appears.

Most Highlighted of All Time

• Passages
• Books

Heavily Highlighted Recently

• Passages
• Books