The Progressive Grocer discusses a study" Clicks & Cravings: The Impact of Social Technology on Food Culture, which finds social/digital media is replacing Mom as the go-to culinary source of knowledge for many people." These surveys are great references - we sense that more people are using social media as a tool for deciding what to eat, how to prepare it, and then chatting about it with others, but here is a study to support those notions.
"The study was jointly developed and conducted by consumer research firm The Hartman Group and Publicis Consultants USA, a food and nutrition marketing agency. Study results show almost half of consumers learn about food via social networking sites, such as Twitter and Facebook, and 40 percent learn about food via websites, apps or blogs."
Impact on food safety - the internet is the wild west of information, where anyone can write anything. It is alway important for people to use trusted sites, and to review information provided in that recipe against validated information (foodsafety.gov for example). If a recipe suggests that you undercook an item, for example to cook chicken to 150F instead of 165F, you should consider not using that recipe.