2D barcodes combined with camera-equipped mobile phones can link print media to the digital world. Common 2D barcode types include QR codes, Data Matrix, and Beetagg, which allow storing various data types. Embedding barcodes in print media can help publishers measure readership, offer additional online content, and enable user participation and interaction through their mobile phones in a simple way. However, standardization of barcode formats and a mobile app are needed for widespread adoption.