The print edition of Creativity (Ad Age's sister publication, aimed at the creative end of the ad business, both traditional and digital) has a section called "Creative Briefing" that deals with breaking trends. (I can't find it online, otherwise I'd link to it.)
One of the trends they spot this month is Twitter, citing the increased use by members of Congress (McCain twitters.) "You might say the last month or so has been a big coming out party for Twitter" the story opens
But ask someone involved in digital media when Twitter had its big coming out party and they'll likely tell you that it was at SXSW in 2008.
Different audiences, different perspectives.