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The iPad clearly dominated the discussion on Twitter over the last few days, but in the early days of January, the devastating earthquake in Haiti, Barack Obama, Tiger Woods, Lady Gaga, Avatar and the Cincinnati Bengals were among the most hotly discussed people and topics on the popular microblogging service.

Social Media monitoring and analytics service Sysomos analyzed over 100 million tweets from January 1 to 15. Overall, the company looked at topics in six different categories: people, locations, film, business, sports and miscellaneous entities.

The aftermath of Iran's election last week was startling. From the eyebrow-raising lopsided vote tally, to the surge of protesters into the streets, to the pivotal role of tools like mobile phones, Twitter, and YouTube in getting the story out, it's hard to say what's been the most remarkable.