ReadWriteWeb relays the following findings from an analysis of the service by Purewire:

• 40 percent of Twitter users have not tweeted since their first day on Twitter (i.e., the account was most likely created and subsequently forgotten about).
• Approximately 25 percent of Twitter users are not following anyone, while two-thirds are following less than 10 people (i.e., the account was created but is not actually being used regularly).
• More than 1/3 of Twitter users have not posted a single tweet, and almost 80 percent of the users have less than 10 tweets (i.e., while Twitter is billed as a great collaboration tool, a large number of users are there to consume content, not distribute it).
• Approximately 30 percent of Twitter users do not have any followers, and 80 percent of Twitter users have less than 10 followers (i.e., for many users, their posts are not being widely tracked or read).

Numbers like these really call claims about Twitter’s popularity into question…