Ask HN: What would make you ditch your business card?

I find it quite cumbersome to carry around business cards so I use a mashup of LinkedIn, Smartr and the default iOS contacts app. Have heard about Brewster but unfortunately it isn't available in Australia yet.

I think having a single mobile app that allowed you to manage/share and also kept your contacts from all your social networks that is backed up in the cloud would be quite useful.