Real-time statistics calculated from Twitter's streaming API
You'll need to add the environment variables OAUTH_CONSUMER_KEY, OAUTH_CONSUMER_SECRET, OAUTH_ACCESS_TOKEN, and OAUTH_ACCESS_SECRET before running. You can get those values by creating a new twitter application at https://apps.twitter.com/, and generating application tokens for it.
To build and run using Cabal's nix-style local builds, just:
bash$ cabal new-build
bash$ ./dist-newstyle/build/twitterStats-0.1.0.0/build/twitterStats/twitterStats +RTS -N4
-N tells GHC how many threads to create, and should generally be set to be at most the number of cores your machine has.
It will print the statistics to the command line every 5 seconds.