A survey found that social media brought little sales during the 2011 and 2012 Black Friday holiday seasons, with contributions of only 0.53% and 0.34% respectively. However, mobile device usage increased, with 27% of shoppers using smartphones to research products and prices, and 15% planning to make purchases on their phones. The number of shoppers visiting stores and retail websites grew to 247 million, up from 226 million the previous year. As a result of increased mobile usage, overall sales increased. The document concludes that retailers will focus more on developing engaging in-store and online experiences, using social media to supplement but not replace their main marketing strategies.