— South Dakotans who want to learn how to better use their cellphones and tablets or who would like help with demystifying social media can sign up for AARP Technology Education and Knowledge (TEK) classes. Following a series of popular TEK courses in Sioux Falls and Pierre, the state office is planning to host classes in communities throughout the state based on requests. TEK courses can introduce participants to smartphones and tablets, privacy settings on Facebook, and how to stay safe …