This document presents summaries and sources for various claims and studies related to the impact of social media on business sales and customer engagement. It discusses findings that only a small percentage of website traffic and conversions come from social media, but that social media interactions like pins on Pinterest can generate revenue. It also notes that social media may build loyalty but that its impact on short-term sales is difficult to measure directly. The document aims to shed light on both positive and uncertain effects of social media on business performance.