Back in the early days of Twitter (way way back in 2007), users had the ability to track keywords, and the results would appear in their timeline. Twitter grew (and continues to grow) like gangbusters, and it was decided it wasn’t feasible to keep that feature around. So, sadly they turned it off.
TweetHook to the rescue!
TweetHook once again enables you to track almost anything you want on Twitter and have the results pushed straight to you.