We conducted a large-scale subjective study of the perceptual quality of User-Generated Mobile Video Content on a set of mobile-originated videos obtained from the Indian social media platform ShareChat. The content viewed by volunteer human subjects under controlled laboratory conditions has the benefit of culturally diversifying the existing corpus of User-Generated Content (UGC) video quality datasets. There is a great need for large and diverse UGC-VQA datasets, given the explosive global growth of the visual internet and social media platforms. This is particularly true in regard to videos obtained by smartphones, especially in rapidly emerging economies like India. ShareChat provides a safe and cultural community oriented space for users to generate and share content in their preferred Indian languages and dialects. Our subjective quality study, which is based on this data, supplies much needed cultural, visual, and language diversification to the overall shareable corpus of video quality data. We expect that this new data resource will also allow for the development of systems that can predict the perceived visual quality of Indian social media videos, and in this context, control scaling and compression protocols for streaming, provide better user recommendations, and guide content analysis and processing. We demonstrate the value of the new data resource by conducting a study of leading blind video quality models on it, including a simple new model, called MoEVA, which deploys a mixture of experts to predict video quality. Both the new LIVE-ShareChat Database and sample source code for MoEVA are being made freely available to the research community at https://github.com/sandeep-sm/LIVE-SC.