Twitter is a social media platform that allows users to post short messages called tweets that are 140 characters or less. It allows users to follow others and have followers, and share information quickly. Twitter can be accessed via the web, desktop applications, or smartphones. Yammer is an internal social network for employees of Sno-Isle Libraries to connect, share information, and stay in touch through groups and file sharing without character limits like Twitter. Both platforms can help spread information quickly within a community.