The header is not true. However, Twitter usage is shaping up as significantly different compared to other social media. According to Harvard Business Review:
Twitter's usage patterns are also very different from a typical on-line social network. A typical Twitter user contributes very rarely. Among Twitter users, the median number of lifetime tweets per user is one. This translates into over half of Twitter users tweeting less than once every 74 days.
Yet, the new users are not tweeting. The median number of tweets is 1! This is mindblowing. To me, this makes Twitter look more like a TV broadcaster than a true social media property. These 20+ million Twitter users are all following Shaq and Ashton Kutcher, and maybe that's it.
The only business disruption of Twitter so far seems to be its assault on RSS. Even with Google Reader, RSS had never broken into the mainstream. Maybe it never will.
Currently, more than 60 percent of U.S. Twitter users fail to return the following month, or in other words, Twitter’s audience retention rate, or the percentage of a given month’s users who come back the following month, is currently about 40 percent. For most of the past 12 months, pre-Oprah, Twitter has languished below 30 percent retention.
I don't want to sound like a Twitter bear, because I am not. I think Twitter's an example of the exciting opportunities the connectedness of the internet opens up. However, we tend to group many things under social media these days and I suspect we're bundling models with very different characteristics. I am trying to digest and understand the taxonomy and recognize the patterns.