Couple of things on initial thoughts:

Some people have blank statuses, when i click them, it turns out its an app or something posting it as their status, is there a way you can filter them, so it doesn't return a blank status?

Secondly, maybe a way to change the font size? Witter uses the volume buttons to increase or decrease the font size, nice feature

One more, can you add alittle more spacing between the statuses? I think that would improove readability alot!

If you need help with any UI design, i could try and help, depending if i have the time, as i'm a web and graphic designer