It's a question of Gravity - Twitter on S60
Gravity is a twitter client for the s60 and I recently installed it on my N95 and so far I’m very happy with it. With an intuitive interface it makes being logged in to two twitter accounts and one identica account very easy. What is especially nice is that you select which account you want to look at and by scrolling left and right you see the friend’s timeline, the replies, your tweets, your DM and finally searches if you want.