he study focused on WhatsApp and Facebook marketing communication as sustainable instruments for the performance of SMEs in Cross River State, Nigeria. It was carried out to examine the impact of Facebook and WhatsApp as sustainable marketing communication tools on the performance of SMEs in Cross River State. The study used a cross-sectional survey research approach. A 5-point Likert scale questionnaire was used to collect data from 289 small and medium-sized firms in the Calabar Metropolis. The collected data was analysed using descriptive statistics, and hypotheses were evaluated using simple linear regression in the Statistical Package for the Social Sciences (SPSS) version 23. The study findings demonstrated that WhatsApp and Facebook usage had a considerable beneficial impact on the marketing performance of SMEs in Calabar. Therefore, the study proposed the following: SMEs should adopt Facebook as a marketing channel to reach a large population of customers, advertise available products/services, and direct customers to locate their shops for patronage. SMEs should consistently employ WhatsApp to interact more closely with customers, advertise available products and services, and deliver customers' orders for greater satisfaction and repeat patronage, ultimately enhancing sales performance.