The most prominent use-case for QR codes is the area of mobile marketing. Because there is free QR code software to read QR codes for almost every smartphone with a camera (e.g. iPhone, Google Android, Blackberry, Symbian), QR codes are used as a link between offline media such as paper and websites. The user just needs to scan the code instead of typing long, unpleasant web addresses. However, a QR image can even be scanned and decoded with older mobile phone cameras and models without Internet access as QR code readers are available for free for less common and legacy platforms. In particular, QR code business cards are perfect to enable others an easy and typo-free import of your own contact details.
I will provide an awesome QR code for any website address, be it your social media account or any other thing. If you want to market it, i will provide the QR code on a T-shirt with a free mockup of a model wearing it.
I will provide you the source files too so that you could print them on your business card or anywhere else. Kindly contact for more details.