Between the guy getting saved by Twitter, and a good showing at SXSW this year, Twitter's been getting some very positive attention lately. In the background there are two services that I don't usually compare to Twitter: Vox and LiveJournal. I think they are interesting services to compare to Twitter, largely because they are both community-based consumer services aiming to build a broad market.
There are some very interesting things to learn about LiveJournal on its Wikipedia entry ... but I had visited that entry because I wanted to take note of the year LJ was introduced: 1999. This is the same year Blogger was introduced and is critical because I posit that LJ's unique visitor numbers (3,534,045 last month) are largely legacy users who have made significant investments in the LJ community.
Vox, like Twitter, launched in 2006 (actually I was a bit surprised to notice that Twitter pre-dated Vox by 3 months!) December 2008 was a turning point. Prior to December, Vox had enjoyed a consistent lead over Twitter in unique website visitors1. In December, there was an user-equilibrium between Vox and Twitter. Since then, Twitter has been steadily outpacing Vox's user numbers.
A number Compete uses to track the deltas in user engagement over time.
Velocity is an effective way to measure the impact of planned (or unplanned) events, such as new advertising campaigns, product/service launches or general site growth. Simply choose an event date as the starting point to see how it has affected a site's Attention over time.
Something really interesting happened on March 26, 2008. Twitter suddenly had net-positive Velocity. If you know what it was, let me know. CC Chapman suggested it might have been SXSW, but I'm not sure. Whatever the reason, since then Twitter has been using
A velocity turning point
1 - Twitter's API and integration with SMS and Jabber make it a real challenge to get true usage metrics on. For this reason I qualify that Compete is measuring only website visitors.
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