Thanks to Mashable, we clearly see power laws at work on Twitter. While many protest this as evidence of "media inequality," the "non-tweeting will always be with us" (to paraphrase Jesus's comment about the persistence of "the poor")--and this is nothing to get bent out of shape about, as Adam has explained.
[caption id="attachment_20419" align="aligncenter" width="496" caption="Courtesy of Mashable, David McCandless"][/caption]