These popular social media channels are driving how many businesses and organizations are sharing information. They need to be a big part of your communications mix as well. Understanding which social media to use and when to use it requires understanding the limits and life cycle of the content posted to each of these channels. Facebook, Twitter, Instagram and You tube are the key channels. The beauty of social media is how easily the content can be linked to other social media channels, and how easily it can be shared with many people.