A boat load of features and one of the easiest on-ramps to Twitter I have seen:
All you need is a Twitter account (user name and password) and you can be up in running in minutes!
Simply send a request to Twitter’s API (with a function like
search_tweets(),get_timeline(),get_followers(),get_favorites(), etc.) during an interactive session of R, authorize the embeddedrstats2twitterapp (approve the browser popup), and your token will be created and saved/stored (for future sessions) for you.
Add to that high quality documentation and examples, what more would you ask for?
Not that I think Twitter data is representative for sentiment measures, etc., but that’s not something you need to share with clients who think otherwise. If they are footing the bill, collect and analyze the data that interests them.