Twitter just rolled out its redesigned front page for those visitors new to Twitter.com. If you’re already a registered user, you won’t notice the new look unless you sign out and refresh the home page. The new homepage helps provide a frame of reference, expectation setting, and also offers a lens into the conversations populating the popular microcommunity that connects people through 140 character strings. Twitter now places an emphasis on search, the very functionality that helped Twitter earn prominence…