Why we chose it: When you publish a monitoring tool called Twitter Grader, you had better be an expert at using Twitter to its greatest advantage. That's not a problem for HubSpot Inc. While its follower base isn't the largest among social media thought leaders, its creativity in leveraging all the features of Twitter and the inventions of the Twitter community made this entry a standout. Among the innovations that impressed us were the use of Twitter Lists to promote members of the HubSpot team, the inclusion of Twitter in a welcome message package to new blog subscribers and HubSpot's “State of the Twittersphere” reports, which position the company as a thought leader through creative use of the statistics it is already gathering as a byproduct of the Twitter Grader service. Other b-to-b businesses may have collected more followers than HubSpot, but few have demonstrated the creativity that this company has brought to its task.