Steven Noble wanted to track news from Iran via Twitter, but noticed that simply searching for relevant terms produced a lot of retweet repetition (where a message is copied and forwarded). However, since Twitter supports using a minus sign to exclude terms, adding
to the end of the search produces the required results. (RT is the abbreviation used to show a message is being retweeted.) While this seems especially topical for the Iran election right now, it’s a simple but useful technique for any Twitter search with a lot of “echo”. Thanks Steven!