Online business cards:
I pick ScanMe.com for ease of use, security against data loss (contacts are saved on smartphones and online), and multiple mobile app platforms. Go here for instructions on registering your online business/calling card and downloading the mobile app to your device. Previously you had to have a Facebook account to register (login) at ScanMe and create your QR code. Now ScanMe also allows use of LinkedIn and Twitter accounts to register. Simply tap the contact buttons on the "contact" screen of the person's QR code you've scanned to connect with them. On the down side, everyone you want to connect with must have an online ScanMe account (and hopefully a smartphone with the ScanMe mobile app) to make it really useful. Scan.Me is an alternative that
