That service is used by publishers to understand what topics are trending, and by companies to do real-time social media monitoring and brand tracking.

FORBES: Topsy Adds Google Plus To Real Time Search Index

For most spectators, the next eight to 12 days involve closely monitoring the race online with the assistance of real-time GPS tracking and video coverage from the trail checkpoints -- available on www.

CNN: Iditarod: A spectator's guide