Twitter's web presence didn't always look as it does today. Using the Internet Archive site (one of my faves), I browsed Twitter's past.
At the beginning of 2006, the site was rudimentary and to-the-point, with the now-famous blue background and (c) Twitter. Landing-page copy began this way: "Twitter is for staying in touch and keeping up with friends no matter where you are or what you are doing."
At the end of 2006, the site looked a bit more recognizable, still text-heavy, and its copyright was shown as (c) 2006 Obvious.
In mid-2007, the site is awash in Twitter blue with round thingies, and at this point it asks the familiar question, "What are you doing?"
For a bit more about Twitter's past, I found this interview with Dom Sagolla. And of course what would we do without Wikipedia's take on Twitter's past?
BTW, according to the Internet Archive, the twitter URL was owned by dotist, a "web business development partner," in 2002. In 2004, the URL seemed to be parked and waiting to be scooped up. . .as it was. What a scoop.