The art of adding features to any product or service is this:
Those who need or want the new features can find them easy.
Meanwhile those who don’t need or want the features don’t even notice them. They are invisible.
Sounds impossible to do, but I think the team at twitter are doing a pretty good job of it. The way I’d try and achieve this would be by making sure the visual structure doesn’t change, and the sequence of events to use it is not interrupted.
shhh – here comes the controversy.