Twitter allows users to post short messages up to 140 characters. It is primarily used by individuals aged 18-29 and males make up 66% of users. Businesses use Twitter to engage customers, share news, and build their brand. Optimal posting times are Mondays and Thursdays from 1-3pm. Promoted tweets and trends are effective advertising options and most users do not find ads intrusive. Analytics tools help measure engagement and understand audiences. While more focused on consumers, businesses can also use Twitter to communicate with stakeholders. Case studies found Wendy's uses Twitter successfully through engagement, responses, and comedy. Paid promotion costs average $1.35 per engagement.