This post is part of Mashable’s Spark of Genius series, which highlights a unique feature of startups. If you would like to have your startup considered for inclusion, please see the details here . The series is made possible by Microsoft BizSpark.

A new study from security firm Barracuda Labs provides some interesting insights into the state of the Twitterverse. Unfortunately for the microblogging startup, the stats say that most of its users aren’t very active. The study looked at around 19 million Twitter accounts (PDF) in order to figure out how people are using Twitter.

This post is part of Mashable’s Spark of Genius series, which highlights a unique feature of startups. If you would like to have your startup considered for inclusion, please see the details here .