HubSpot released a report based on the analysis of over 600,000 Twitter users who have utilized the company’s Twitter Grader app. The full study is free and available for download in PDF.

Here are the highlights:

– Twitter has about 4-5 million users, about 30% are relatively new or unengaged users

– Twitter is dominated by newer users – 70% of Twitter users joined in 2008

– An estimated 5-10 thousand new accounts are opened per day

– 35% of Twitter users have 10 or fewer followers

– 9% of Twitter users follow no one at all

– There is a strong correlation between the number of followers you have and the number of people you follow

– The average number of followers is 70

For a deeper analysis and interpretation of the numbers presented in the report, please visit Marshall Kirkpatrick’s post at ReadWriteWeb (notice the URL vs. the post title).

Since we’re on the subject of Twitter, I was updating my post, “Twitter Tools for Community and Communications Professionals,” when I stumbled across a couple of interesting graphs that visualize the top applications for Twitter in real time.

In the following charts, you’ll notice that the Web accounts for almost half of all Twitter interaction and that TwitterFeed represents a strong second position. But that’s where the similarities between the two graphs end, and interesting differences arise.

TweetScan:

Stats by Funkatron.com:

More conversations related to the top Twitter apps on flickr, believe it or not!

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Related reading on PR 2.0:

– Introducing @MicroPR, A PR Resource for Journalists, Analysts and Bloggers on Twitter
– Twitter Tools for Community and Communications Professionals
– In the Social Web, We Are All Brand Managers
– The State of Social Media 2008
– The Social Revolution is Our Industrial Revolution
– The Essential Guide to Social Media
– The Social Media Manifesto
– PR 2.0: Putting the Public Back in Public Relations
– Introducing The Conversation Prism
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