Globalization poses significant challenges for businesses like Tesco when using the internet as a marketing tool. One major challenge is communication with customers, which largely relies on online interactions. The rapid pace of technological change also requires employees to constantly update their skills and knowledge to keep up with new technologies and features. Furthermore, security concerns are a major issue, as online businesses must protect customer data and payment systems from potential threats. Despite these challenges, the use of internet marketing and social media can still be beneficial for Tesco, allowing it to increase its customer base and profit margin.