This document is a dissertation presented at Northumbria University for a BA in Journalism in 2014-15. It examines the impact of social media on customer service, using Tesco as a case study. Through a literature review and analysis of Tesco's social media strategies, the dissertation finds that social media deployment can significantly benefit companies by improving customer interaction, engagement, and satisfaction. It discusses how speed of response is important for customer service on social media platforms like Twitter and Facebook. The case study shows Tesco uses a wide range of social media tactics to provide customer service and raise engagement levels.