How Many People Actually Use Twitter?

How Many People Actually Use Twitter?. But how many of those visitors – many of whom are likely checking out Twitter after hearing about it on TV – are actually signing up for the service? eMarketer takes a stab at that question today, and estimates that there are currently about 6 million registered Twitter users, which equates to around 3.8 percent of people on the Internet. The research firm further projects that those numbers will double by the end of this year to 12.1 million users, and gap up another 50 percent in 2010 to bring the service to a total audience of roughly 18 million registered users.

Now, I'm just curious, has anyone seen stats on Twitter and college students?  Any other demographic info?

Comments

[Mark Pond]

This from Computerworld:

Twitter quitters are fleeing the site in droves
...of Twitter users do not return to the microblogging site the next month. And for the 12 months prior to Oprah Winfrey joining Twitter this month with great media fanfare, the site had a retention rate of less than 30%.

[Mark Pond]

Ooops. The full extent of what I thought I had copied didn't paste. Go here for the full scoop:

http://www.resourceshelf.com/2009/04/29/twitter-quitters-are-fleeing-the-site-in-droves/