Twitter that comes standard on my iPhone 4S isn't working

The twitter app that comes on my phone through ios 5.1 doesn't work at all. When I try to open it up in settings it just freezes up and won't load and neither does the app I just see the back ground of what it would look like. I've tried restoring setting repudating my whole phone also from sctratch and that didn't work also what else can I do??