Some of us at Semiocast are quite passionate about photography. We followed the official announcement of the Canon 5D mark III just a few months after Nikon released it Nikon D800 / D800E in February. The buzz generated about 35 000 messages on Twitter.
The announcement of the Canon 5D mark III almost quadrupled the rate of messages about Canon (from a consistent 2000 messages per hour to almost 8000 messages in one hour). Messages actually about the Canon 5D mark III reached a peak of about 5000 messages in one hour.
Semioboard also spotted a buzz the day before about a contest to win either an Nikon D800 or a Canon 5D mark III. The contest was organized by Photofocus and ViewBug. More than 5000 messages were generated over 2 days.