burrrd. is a free tool for everyone, which allows you to analyze Twitter accounts. Just enter a Twitter @handle and click the button, burrrd. will do the rest. Analytics and insights (like common words, hashtags & more) into any public account will be presented to you with a beautiful design after a few seconds. oAuth allows a more detailed result.
Twitter Promote Mode
Auto-amplify your business and Tweets with a subscription
Promote Mode is an always-on, amplification engine. It automatically promotes your Tweets and profile, steadily attracting more followers and additional reach for a flat fee of $99 per month. There’s no ad campaign management necessary. People using Promote Mode just Tweet as they normally do -- publishing updates for their audience.